An instantiation linkage system for a chain of trade paths

Abstract

The application provides an instantiation linkage system of a chain trade path, and belongs to the technical field of international trade digital management and enterprise information system. The system adopts a double-layer architecture of a template layer and an instance layer, uniformly carries three types of nodes of a trade subject, an order and a document through a chain structure of a predecessor pointer, realizes chain path conflict-free instantiation through an identification remapping algorithm, supports sub-path splitting, multi-price type pricing, document fission generation and automatic cost allocation, realizes cross-form field accurate incremental linkage and full-link change traceability. The application reduces the manual dependence of foreign trade documents operation, significantly improves data consistency, operation efficiency and compliance, and is suitable for complex international trade scenes such as multi-level transshipment.

Description

Technical Field

[0001] This invention relates to the field of international trade digital management and enterprise information system technology, and in particular to an instantiation linkage system for a chain-like trade path. Background Technology

[0002] In international trade, an export order typically involves multiple entities—the manufacturer, supplier, domestic exporter, overseas transit party, and overseas recipient—flowing through various stages from factory production to overseas delivery. Different combinations of these entities correspond to different customs declaration, commodity inspection, foreign exchange settlement, and tax refund rules; this is known in the industry as the trade path. Complex paths such as entrepot trade, bonded zone tours, and multi-exporter linkages are common business models for foreign trade enterprises to optimize tariffs, ensure foreign exchange compliance, and plan tax refunds.

[0003] Existing trade order systems generally suffer from the following technical defects: First, trade paths rely heavily on manual experience for maintenance. Trade entities, orders, and documents are typically managed independently in separate tables, and the flow relationships between entities are often recorded in the form of ordered lists or manual notes. It is difficult to perform full-link structured modeling of trade entities, orders, and documents through a unified data structure. For complex paths such as transshipment, bonded zone loops, and multi-exporter connections, the configuration process is cumbersome, and path experience is difficult to accumulate and reuse. Each order requires manual re-organization of the link, which is inefficient and prone to errors. Second, if a chained data structure is used to represent trade paths, when instantiating and copying them, if the globally unique identifier of the template node is directly used, different orders instantiating the same path will cause identifier conflicts, leading to data mix-up problems when deleting nodes or performing related queries, thus disrupting data isolation between orders. If the node identifier is directly changed, it is easy to cause the chain of references to break, making it impossible to retain the original path's topology. Third, core processes such as determining the country of trade, splitting documents, calculating prices, and allocating costs heavily rely on manual judgment. In scenarios involving multiple exporters, the number of documents increases exponentially with the number of exporters. Manual calculations are prone to issues such as inconsistent unit prices, uneven allocation, and errors in filling in the country of trade, leading to compliance risks in customs declarations. Fourth, the fields in related forms such as shipping plans, customs declarations, and settlement documents derived from trade routes are highly coupled. Existing systems mostly achieve field synchronization through scattered hard coding, resulting in high maintenance costs and poor flexibility in rule changes. Furthermore, in high-concurrency scenarios, multiple changes to the same record are prone to out-of-order overwriting, and the lack of a reliable failure recovery mechanism makes it difficult to guarantee data consistency across forms. Summary of the Invention

[0004] This invention provides an instantiation linkage system for chain-like trade paths to solve the aforementioned technical problems.

[0005] This invention provides an instantiation and linkage system for chain-like trade routes, comprising: a trade route template management module, a route instantiation processing module, a sub-route splitting and document generation module, and a form field linkage engine module; The trade path template management module is used to construct and store trade path templates. The trade path template is formed by connecting several trade nodes through a predecessor pointer of the preceding entity ID to form a single chain structure. Each trade node carries the attributes of node number, entity type, subject type and price type. The entity type includes three types: trade subject, order entity and document entity, so that the physical trade link and the derived orders and documents are uniformly expressed in the same chain structure. The path instantiation processing module is used to clone the selected trade path template into an order-specific trade path instance during the order shipment process. During instantiation, a new globally unique identifier is assigned to each instance node, a remapping table from template identifier to instance identifier is established, all instance nodes are traversed twice, and the predecessor pointer of each node is rewritten according to the remapping table. The chain reference chain is maintained while the identifier is changed. The sub-path splitting and document generation module is used to split trade sub-paths according to the combination of producers and suppliers, calculate the sub-order price according to the price type corresponding to the node, automatically generate customs declaration, foreign exchange settlement, and financial documents based on the number of sub-paths and the number of exporter nodes, and allocate freight according to the proportion of cargo weight and insurance according to the proportion of cargo value. The form field linkage engine module is used to capture real changes in form fields, match linkage targets based on declarative routing rules, propagate changes to associated forms through an asynchronous ordered pipeline that follows the records sequentially, and ensure eventual data consistency through memory backoff retries and timed replay in the database.

[0006] Preferably, the subject types of the trade nodes include six categories: producer, supplier, exporter, transit party, terminal receiver, and designated receiver. Each subject type corresponds to a subdivided subject role qualification. When instantiating and selecting an actual trade subject, the available subjects are filtered according to the subject roles preset by the node to ensure that the qualifications of the selected subject match the path design.

[0007] Preferably, the path instantiation processing module further includes a concurrent anti-duplicate unit and an instance reuse unit; The concurrent anti-duplicate unit uses the template path ID and order ID as unique keys, and rejects duplicate instantiation requests through a dual mechanism of distributed lock and database unique index; The instance reuse unit reuses the original instance ID when the order has generated associated documents, and only updates the node body and price information.

[0008] Preferably, it also includes an automatic trade country derivation module, which is used to filter the exporter node with the largest sequence number in the path according to the node sequence number, obtain the main body information of the downstream adjacent node of the exporter, query the country to which the main body belongs to obtain the initial trade country, and output the final trade country by superimposing preset business coverage rules.

[0009] Preferably, the sub-path splitting and document generation module supports multiple independent sub-paths under the same combination of producer and supplier, which are distinguished by independent sub-path identifiers; The price types include four categories: internal procurement price, discount percentage, inter-company price, and export price. Each category executes its corresponding calculation logic using a strategy mode. Among them, the internal procurement price supports manual entry of downgrade schemes.

[0010] Preferably, single-certificate fission includes: Generate a set of basic customs declaration documents for each trade sub-path; When a node with export customs declaration qualification is added to the corresponding trade sub-path, additional customs declaration documents equal to the number of basic documents are generated for the downstream adjacent sub-orders of that node with export customs declaration qualification. Financial invoices are automatically generated for sub-orders downstream of the last exporter node in the corresponding trade sub-path, with the last exporter node serving as the dividing line.

[0011] Preferably, the form field linkage engine module includes a field change capture unit, a declarative routing unit, an ordered pipeline execution unit, and a failure retry unit; the field change capture unit is used to compare the field-level differences between the old and new values ​​of form data through reflection and annotation, and only publishes a row change event when there is a real change. The declarative routing unit is used to provide chained declarative API configuration linkage rules, supports direct copying of fields and custom calculation assignment, and the rules are matched according to the registration order and support priority configuration. The ordered pipeline execution unit is used to build a serial processing chain for each business document primary key. Changes to the same document are strictly executed in sequence, while different documents are processed in parallel. The failure retry unit employs a two-layer retry mechanism consisting of memory exponential backoff retries and persistent layer timed polling replays. All linked operations are idempotent based on the primary key and data version number.

[0012] Preferably, the chain structure supports adaptation between loop paths and branch paths, wherein: For loop paths: Set a loop identifier field on the trade node to mark the loop attribute. The predecessor pointer of the loop node points to the corresponding upstream node of the path. The node number keeps increasing linearly. After the business layer recognizes the loop identifier, it performs document generation and country deduction according to the loop trade rules. For branch paths: The main chain node is associated with an independent sub-path instance through the branch sub-path ID field. The main chain itself maintains a single-chain topology, and the business logic of the branch path is independently carried by the associated sub-path instance.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Structured Accumulation of Trade Experience and Unified Representation of Complex Trade Links: Through a two-layer modeling approach (template layer-instance layer) and a predecessor pointer chain structure, accumulated trade path experience is transformed into reusable structured templates. These templates allow for one-time configuration and multiple reuses. A single chain structure simultaneously supports three types of nodes: trade entities, orders, and documents. It can uniformly represent trade links of arbitrary complexity, such as multi-level transshipment, bonded zone loops, and multi-exporter sequences, providing a unified data foundation for fully automated processing. This chain relationship can be directly mapped to a trade link knowledge graph, supporting business compliance analysis and path optimization, and can also serve as the foundational data model for a digital twin of the entire trade process.

[0014] 2. Resolve the issue of identifier conflicts in chained instantiation: By using an identifier remapping algorithm, the global identifier of nodes is changed and strict isolation of data between orders is ensured while the chained reference topology is fully preserved. This avoids issues such as order duplication and broken reference chains. Combined with concurrency anti-duplicate and instance reuse mechanisms, it can support stable operation in high-concurrency scenarios and is compatible with complex business scenarios such as re-instantiation and reissue of invoices.

[0015] 3. Full-process automation improves the efficiency and accuracy of document processing. Automatic country-of-trade derivation, intelligent sub-path splitting, automatic calculation of multiple price types, document fission generation, and automatic cost allocation are all automated. The process transforms the work that originally relied heavily on human experience into automatic calculation by the system, which significantly reduces the probability of human error. The efficiency improvement is particularly obvious in complex scenarios with multiple exporters. At the same time, it ensures that the document elements are strictly consistent with the actual trade path, reducing the compliance risks of customs declaration.

[0016] 4. A highly reliable and easily maintainable cross-form linkage mechanism: Declarative routing configuration replaces scattered hard-coded rules, significantly reducing the development and maintenance costs of linkage rules. Rule adjustments do not require modification of business code. Following an asynchronous, ordered pipeline of records sequentially, it avoids out-of-order overwriting of concurrent writes to the same record without sacrificing overall throughput. A two-layer failure retry mechanism ensures eventual consistency in cross-form field propagation. The engine's distributed architecture supports cloud-edge collaborative deployment, enabling low-latency data synchronization at branch edge nodes, and unified management of rules and data reconciliation in the cloud.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a structural diagram of an instantiated linkage system for a chain-type trade path in an embodiment of the present invention; Figure 2 This is a system structure diagram in an embodiment of the present invention; Figure 3 This is a flowchart of the engine processing link in an embodiment of the present invention. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] This invention provides an instantiation and linkage system for chain-like trade paths, such as... Figure 1 As shown, it includes: a trade route template management module, a route instantiation processing module, a sub-route splitting and document generation module, and a form field linkage engine module; The trade path template management module is used to construct and store trade path templates. The trade path template is formed by connecting several trade nodes through a predecessor pointer of the preceding entity ID to form a single chain structure. Each trade node carries the attributes of node number, entity type, subject type and price type. The entity type includes three types: trade subject, order entity and document entity, so that the physical trade link and the derived orders and documents are uniformly expressed in the same chain structure. The path instantiation processing module is used to clone the selected trade path template into an order-specific trade path instance during the order shipment process. During instantiation, a new globally unique identifier is assigned to each instance node, a remapping table from template identifier to instance identifier is established, all instance nodes are traversed twice, and the predecessor pointer of each node is rewritten according to the remapping table. The chain reference chain is maintained while the identifier is changed. The sub-path splitting and document generation module is used to split trade sub-paths according to the combination of producers and suppliers, calculate the sub-order price according to the price type corresponding to the node, automatically generate customs declaration, foreign exchange settlement, and financial documents based on the number of sub-paths and the number of exporter nodes, and allocate freight according to the proportion of cargo weight and insurance according to the proportion of cargo value. The form field linkage engine module is used to capture real changes in form fields, match linkage targets based on declarative routing rules, propagate changes to associated forms through an asynchronous ordered pipeline that follows the records sequentially, and ensure eventual data consistency through memory backoff retries and timed replay in the database.

[0022] In this embodiment, the predecessor pointer chain structure refers to a data structure that stores the globally unique identifier of the previous node in each node, forming a unidirectional chain reference relationship. Unlike ordinary ordered lists, this structure can directly locate upstream and downstream nodes through pointers and supports the mixed carrying of different types of business entities.

[0023] The identifier remapping table is a mapping data table that stores the one-to-one correspondence between the unique identifiers of template nodes and the unique identifiers of instance nodes. It is used to batch replace node identifiers and correct reference relationships during the instantiation process.

[0024] The asynchronous ordered pipeline based on serial records refers to an asynchronous task processing queue established for each business record, using the primary key of the business document as the granularity. All change tasks for the same record are executed serially in the order of submission, while tasks for different records are executed in parallel. Simply put, modifications to the same document are processed one by one in chronological order, while modifications to different documents are performed simultaneously, without out-of-order overwriting or affecting the overall processing speed.

[0025] Declarative routing rules refer to a method of defining the mapping relationship between source field changes and target field updates through configuration syntax, eliminating the need to write procedural execution code. Rules are centrally registered and managed in a unified manner.

[0026] In this embodiment, the trade route template management module constructs a two-layer data model: a template layer and an instance layer. The template layer is used to accumulate reusable general trade routes, while the instance layer carries runtime snapshots after order binding. A trade route consists of several trade nodes linked together by a preceding entity ID pointer to form a single-chain structure. Each node carries attributes such as node sequence number, entity type, subject type, price type, and subject role. Entity types are divided into three categories: trade subject, order entity, and document entity, enabling the physical trade link and its derived orders and documents to be uniformly represented in the same chain-like relationship graph.

[0027] The node's subject types cover all roles, including producers, suppliers, exporters, transit parties, end-users, and designated recipients. Each subject type corresponds to a subdivided qualification role, and subject selection is filtered by role during instantiation to ensure path compliance. For complex paths such as loops and branches, the underlying single-chain structure remains unchanged, and adaptation is achieved through backflow identifiers and branch sub-path associations to ensure data structure consistency.

[0028] In this embodiment, the path instantiation processing module clones the selected template into an order-specific instance during the order shipment process. The core execution of the reference chain fidelity identifier remapping algorithm is as follows: assign a new globally unique identifier to each instance node, establish a remapping table of template identifier → instance identifier, traverse all instance nodes twice, and rewrite the predecessor pointer of each node according to the remapping table, so as to completely preserve the chain topology while changing the identifier.

[0029] The module is configured with both a concurrency anti-duplicate unit and an instance reuse unit: the concurrency anti-duplicate unit uses the template path ID and order ID as unique keys, employing a dual mechanism of distributed locks and database unique indexes to prevent duplicate submissions; the instance reuse unit reuses the original instance ID when the order has generated associated documents, updating only node information to avoid the loss of sub-path and document data due to re-instantiation. The instantiation process supports transaction rollback, and any abnormal step automatically cleans up dirty data, restoring the system to its pre-operation state.

[0030] In this embodiment, the automatic trade country derivation module defines the trade country as the country of the downstream entity of the last exporter node. It automatically calculates along the chain: filtering by node number to select the exporter node with the highest number, reading the entity identifier of its immediate downstream neighbor, querying the company table and customer table sequentially to obtain the country, and then overlaying the business coverage rules to output the final result. The entire process requires no manual input. The business coverage rules have higher priority than the automatic derivation result, are maintained in a configurable manner, and support expansion by sales organization, trade model, and entity role.

[0031] In this embodiment, the sub-path splitting and document generation module splits order goods into trade sub-paths based on the combination of producer and supplier. It supports the coexistence of multiple independent sub-paths under the same combination, distinguished by independent sub-path identifiers, adapting to batch customs declaration scenarios. The module has a built-in multi-price type pricing engine, which executes calculation logic for four price types: internal purchase price, discount percentage, inter-company price, and export price, respectively, using a strategy mode. The internal purchase price is integrated with the SAP system and supports manual entry of downgrade schemes.

[0032] Document generation follows a fission rule: each sub-path generates a set of basic customs declaration documents, and for each additional node with export qualifications, its downstream sub-orders generate an additional number of documents; freight is allocated based on the gross weight of the goods, and insurance premiums are allocated based on the value of the goods. Financial invoicing is based on the last exporter, automatically generating corresponding invoices for downstream sub-orders.

[0033] The core calculation formulas involved in this module are as follows: Discount price calculation formula: ,in: This is the discounted price, and the currency unit is the same as the base price; The base price before discount (SAP net asset value is used in this system), with the same currency unit as the discounted price; r is the discount percentage, dimensionless, and its value range is... The smaller the value, the greater the discount.

[0034] Formula for calculating the total number of customs declaration documents: Where: N is the total number of customs declaration documents, dimensionless; n is the total number of trade sub-paths, dimensionless; m is the total number of nodes in the trade path with export customs declaration qualifications, dimensionless.

[0035] Formula for calculating freight cost allocation: ,in: This represents the freight cost to be allocated to the i-th set of documents, with the currency unit consistent with the total freight cost. This represents the total freight cost for this segment of logistics, with the currency unit consistent with the allocated freight cost; This represents the gross weight of the goods corresponding to the i-th set of documents, with the same unit of weight as the total gross weight. This refers to the total gross weight of the goods, with the unit of weight consistent with the gross weight on the document.

[0036] Premium sharing calculation formula: ,in: R represents the premium for the i-th set of documents, with the currency unit consistent with the value of the goods; R is the insurance premium rate, which is dimensionless and determined by the insurance agreement. Let be the value of the goods in the i-th set of documents, with the currency unit consistent with the insurance premium; k is the insurance surcharge coefficient, dimensionless, with a fixed value of 1.1, corresponding to the industry practice in international trade of insuring at 10% of the value of the goods, used to cover expected costs such as freight and insurance premiums in addition to the value of the goods.

[0037] The form field linkage engine module consists of a field change capture unit, a declarative routing unit, an ordered pipeline execution unit, and a failure retry unit. The field change capture unit uses Java reflection combined with the `@JSONField` annotation to perform field-level difference comparison; null values ​​and empty strings are not counted as changes. A row change event is only published when a truly changed column exists, reducing invalid propagation from the source. The declarative routing unit provides a chained DSL configuration for linkage rules, supporting direct field copying and custom calculation assignment. Rules support priority configuration; when multiple rules match the same change, they are executed from highest to lowest priority. If priorities are the same, they are executed according to the registration order, with later registered rules overriding assignments to the same field. The ordered pipeline execution unit uses `ConcurrentHashMap.compute` atomic operations combined with the `CompletableFuture.thenCompose` method to build a serial processing chain for each business document's primary key. Changes within the same document are strictly executed in an ordered manner, while different documents are processed in parallel, balancing data consistency and system throughput. The failure retry unit adopts a two-layer mechanism of memory exponential backoff and timed replay in the database. All linked operations are based on the primary key and data version number to achieve idempotency: before execution, the version number of the target record is checked. If the versions are inconsistent, the old event is discarded. During the update, the primary key plus the version number is used as the condition. After the update is successful, the version number is incremented to ensure that the same change will not be executed repeatedly.

[0038] This system is developed based on the Spring Boot technology stack and adopts a layered architecture design, consisting of four layers from top to bottom. The overall architecture is as follows: Figure 2 As shown.

[0039] Access Layer: Provides interactive entry points for roles such as business assistants, subsidiary customs declaration and documentation staff, headquarters customs declaration and documentation staff, freight forwarders, production staff, and credit insurance staff, supporting access from both web and mobile devices.

[0040] Business service layer: includes shipping planning service, trade route service, document generation service, freight calculation strategy engine and OA approval integration strategy factory, which carries the core business logic.

[0041] Engine and infrastructure layer: Includes a form field linkage engine, a self-developed dynamic thread pool and scalable queue, as well as integration and adaptation with external systems such as SAP, International Trade Single Window, Contract Lock electronic signature, and OA.

[0042] Data layer: MySQL relational database is used to store trade path templates, instances, nodes, sub-paths, product details, and various business document data.

[0043] The system organizes collaborative operations around the export order lifecycle. The overall business process is as follows: contract orders are pushed down to generate shipping plans → shipping plans are submitted for approval → shipping order inquiry and price comparison data are fed back and the trade path entry is opened → headquarters customs declaration and document staff select trade paths and instantiate and determine each trade entity → subsidiary customs declaration and document staff split trade sub-paths → the system automatically calculates sub-order prices and automatically generates each set of documents → electronic signature, commodity inspection, customs declaration, foreign exchange settlement, and issuance of financial invoices.

[0044] In this embodiment, the detailed implementation of the trade route template management module includes: Chained node structure: The trade path is a single chain formed by a group of trade nodes linked together by a predecessor pointer (previousEntityId), with the serialNumber node sequence number ensuring order. Unlike a regular ordered list, this chained structure can accommodate three types of entity nodes, distinguished by the entityType field, as shown in Table 1 below.

[0045] Table 1. Related Tables for Chain Structures

[0046] In this embodiment, subject type and subject role: The `subjectType` of a node characterizes the role sequence of the trade chain, while `subjectRole` further distinguishes the subject's qualification attributes, forming the basis for compliance path design. The complete definitions of subject type and role are shown in Tables 2 and 3 below: Table 2 Subject Type Table

[0047] Table 3. Subject Types and Role Names

[0048] When instantiating and selecting an actual trading entity, the system automatically verifies the matching between the entity's qualifications and the node's preset roles; if the entity's qualifications do not meet the node's role requirements, an interception prompt will pop up and the selection will be prohibited to ensure the compliance of the trade path.

[0049] The system uses a single-chain structure at its core, and adapts to special and complex paths by extending fields without modifying the core data structure, thus ensuring the consistency of the data model.

[0050] Loop Path Adaptation: A typical loop path scenario is a one-day trip to a bonded zone, where goods exit the country, enter the bonded zone, and then flow back into the country. The adaptation method is to add an `is_backflow` flag field to the trade node, with a value of 0 representing a non-backflow node and 1 representing a backflow node. The `previousEntityId` pointer of the backflow node points to the corresponding upstream node in the path, and the node sequence number remains linearly increasing. The underlying data remains a single-chain structure. After the business layer identifies the backflow flag, it processes the data according to the loop trade rules: the country of trade is automatically determined to be China (CN), customs documents are generated separately for exit and entry, and prices are calculated separately for the two segments. This design does not require modification of the core chain structure; loop business can be supported simply through business layer logic adaptation.

[0051] Branch path adaptation: A typical scenario for branch paths is splitting a main order into multiple parallel sub-production chains. The adaptation method is as follows: a nested main-sub-path pattern is adopted. The main path maintains a single-chain structure, and a `branch_route_id` field is added to the branch nodes to associate them with independent sub-path instances. The product, price, and document logic of the branch chain is independently handled by the sub-path instance, while the main chain only retains the aggregation node to maintain the integrity of the single-chain topology. The field linkage and document generation of the branch path are all executed in a closed loop within the sub-path instance. The main chain node only synchronizes and summarizes data, which satisfies the needs of the branch business without disrupting the consistency of the chain structure of the main chain.

[0052] Single-node multi-entity storage logic: When the template node is of the producer type, and the business allows for multiple producer entities, the instantiated node can support multiple entities. The storage method is as follows: the actual entity field of the instance node table stores the GUIDs of multiple entities in JSON array format, used only for aggregation and display. In the subsequent sub-path splitting stage, it will be split into independent sub-paths based on a single producer. All business logic is implemented at the sub-path level; no specific business calculations are performed at the node level. This design ensures both the simplicity of template configuration and compatibility with business scenarios involving multiple producer entities.

[0053] In this embodiment, the detailed implementation of the path instantiation processing module includes: The overall instantiation process is as follows: Once an order enters the shipping phase and the shipping order inquiry and price comparison data are returned, the system opens the trade route instance entry point. The instantiation process is handled by the ShipmentPlanServiceImpl, and the execution steps are as follows: Concurrent deduplication prevention: Using the template path ID and order GUID as unique keys, it first attempts to acquire a Redis distributed lock. If the acquisition fails, it directly rejects duplicate requests. At the same time, a unique index for this combination is created in the database instance table. Under extreme concurrency, database constraints are used as a fallback to completely prevent duplicate instantiation.

[0054] Instance reuse determination: Check whether the order has generated associated commodity inspection and customs declaration documents. If it has, reuse the original instance ID and only update the node main body and price information to avoid the loss of sub-path and document data due to re-instantiation. Supports scenarios such as re-instantiation to reissue invoices.

[0055] Node tree cloning and price initialization: Read all node data from the template, clone the initial data of the instance nodes, and assign initial prices to the order entity nodes according to their price types.

[0056] Reference chain fidelity remapping: Execute the identifier remapping algorithm to generate a new instance node identifier and correct the predecessor pointer.

[0057] Transaction commit and rollback: The database transaction is committed after all steps are executed successfully. If any step encounters an exception, the transaction is automatically rolled back, clearing all instance data generated in this operation and restoring the state to that before the operation.

[0058] Identifier Remapping Algorithm: The globally unique identifier (GUID) of a template node is fixed. If it is directly used during instantiation, different orders instantiating the same path will result in duplicate identifiers across orders, leading to order mix-up issues when deleting or querying by identifier. This algorithm solves this problem through two traversals, with the following steps: First, traverse all template nodes, assign a new instance UUID to each node, and simultaneously establish a key-value remapping table for template GUID → instance GUID; Second, traverse all instance nodes again, replacing the previousEntityId field value of each node with the corresponding instance GUID based on the remapping table. This algorithm replaces all node identifiers, ensures strict data isolation between orders, and completely preserves the topology of the predecessor reference chain, avoiding the problem of broken reference chains.

[0059] In this embodiment, the automatic country-of-trade derivation module is implemented in detail as follows: The trade country derivation algorithm executes automatically along a chain path without manual input. The specific steps are as follows: Sort all nodes in ascending order by serialNumber, filter out the transit nodes whose main body type is exporter or whose main body role has export customs declaration qualifications, and take the node with the largest serial number, which is the last exporter on the path.

[0060] Find the downstream neighboring node with the sequence number of the exporter + 1, and parse its actual GUID.

[0061] Country-by-count lookup priority: First, query the country / region to which the entity belongs by GUID in the company entity table; if it is not a company entity, then query the customer table to obtain the initial trade country.

[0062] Overlay Business Coverage Rules: These rules have higher priority than the automatically derived results, and the covered country is forcibly used when certain conditions are met. Currently built-in rules include: ① When the company code of the sales organization is 3001 (Hong Kong, China) or 3004 (Singapore), the trade country is fixed as HK; ② When the bonded zone day trip model is in effect and the final recipient is a domestic entity, the country is fixed as CN. These rules are maintained in a configurable manner in the system parameter table and can be extended by sales organization, trade model, and entity role without requiring code modification.

[0063] In this embodiment, the detailed implementation of the sub-path splitting and document generation module is as follows: Sub-path splitting rules: The subsidiary's customs declaration and documentation staff splits goods according to the combination of manufacturer and supplier. The system maintains the remaining quantity to be split in real time. The sub-path can only be confirmed after all goods have been allocated. The splitting rules are as follows: By default, products are automatically aggregated based on a unique combination of manufacturer and supplier to generate initial sub-paths. Multiple independent sub-paths can be manually added, each uniquely identified by tradeSubRouteId.

[0064] Triggering scenarios for multiple sub-paths in the same combination include: goods needing to be inspected and declared in batches, corresponding to different regulatory conditions, and customs declarations for separate containers.

[0065] In the scenario of shipment in batches, the quantity of unshipped goods to be split is automatically carried over to the next batch shipment plan, and the total quantity is consistent with the order verification after all batches are completed.

[0066] Double verification is performed upon submission: the sum of the quantities of all goods must equal the total quantity shipped this time, and over- or under-quantity shipments are not allowed; The same product cannot be assigned to multiple sub-paths to avoid duplicate customs declarations.

[0067] Multi-price type pricing engine: When generating sub-paths, the system calculates prices according to the price type of the order node using a strategy model. The calculation logic for the four types of prices is shown in Table 4 below.

[0068] Table 4 Calculation Logic Table

[0069] Document splitting and cost sharing: Document splitting rules: Each trade sub-path generates one set of basic commodity inspection and customs declaration documents, with the header being the first exporter in the path, and the production / sales unit corresponding to the sub-path.

[0070] For each additional node with export customs declaration qualifications added to the path, an additional set of customs declaration documents equal to the number of basic documents is generated for its immediate downstream sub-orders; the total number of sets is calculated using the formula for total number of documents. Documents corresponding to different exporters correspond to independent customs declaration stages, respectively corresponding to different customs supervision scenarios such as domestic export, bonded zone exit, and re-export, thus eliminating the issue of duplicate declarations.

[0071] If the shipment plan includes free promotional items, a separate customs declaration form will be generated for the promotional items. The production unit will be the factory listed on the consignment note, and the sales unit will be the domestic joint-stock company. The customs declaration form will note that the promotional items are free and have no commercial value.

[0072] For each downstream sub-order corresponding to the exporter, corresponding settlement documents (commercial invoice, packing list) are generated simultaneously for the foreign exchange settlement of the corresponding entity.

[0073] Cost sharing rules: Freight costs are allocated according to the proportion of the gross weight of the goods in each set of documents, following the freight allocation formula.

[0074] Premium: The premium is allocated according to the proportion of the value of each set of documents, following the premium allocation formula.

[0075] Financial Invoicing Rules: Invoicing scope: The last export node in the path is the dividing line. All sub-orders after that node must be issued with a financial invoice; inter-company transactions between exporters will automatically generate internal settlement vouchers.

[0076] Invoice types: Export sales invoices (zero-rate VAT general invoices) are issued for the export segment; VAT special invoices are issued for the domestic segment for input tax deduction and tax refund accounting; and local compliant commercial invoices are issued for the overseas transit segment.

[0077] The invoice amount strictly corresponds to the price calculation for the corresponding order segment, and the quantity is consistent with the quantity of goods in the sub-path, ensuring consistency of invoice data.

[0078] In this embodiment, the form field linkage engine is implemented in detail as follows: The engine processing chain is as follows: change capture → declarative route matching → plan compilation and execution → asynchronous ordered delivery → retry on failure. The overall process is as follows: Figure 3 As shown.

[0079] Step 6.1: Field-level change capture: ModelMappingPublisher uses Java reflection combined with the @JSONField annotation to perform field-level comparisons of old and new values ​​in the form data model, excluding null values ​​and empty strings from being counted as changes; field metadata is cached using a ConcurrentHashMap to improve performance. RowChangedEvent events are only published when a column has actually changed, preventing invalid field propagation from the source.

[0080] Step 6.2: Declarative Routing DSL: RouteRegistry provides a chained declarative API that expresses linked rules as readable configurations. All rules are centrally registered, managed, and maintained by the DefaultRoutesInitializer class.

[0081] Multi-rule conflict handling: When multiple routes match the same source field change, they are executed from high to low priority; if the priority values ​​are the same, they are executed according to the registration order, and the later registered rule will override the earlier registered rule for the same target field.

[0082] Step 6.3: Follow the asynchronous ordered pipeline of records sequentially: AsyncEventBus employs a double-checked locking singleton pattern, with its core being orderedPipelines. The implementation works as follows: using the business document's primary key GUID as the key, the atomicity of ConcurrentHashMap.compute ensures the uniqueness of the pipeline for the same record; CompletableFuture.thenCompose appends new change tasks to the end of the existing task chain, thus creating a processing chain for each record. This design guarantees that multiple changes to the same document are executed strictly in the order of submission, preventing out-of-order overwriting; simultaneously, tasks from different documents are executed in parallel without sacrificing overall system throughput. The granularity of the record is the business document's primary key; that is, all field changes to independent business documents such as the same shipping plan or customs declaration share a single serial pipeline.

[0083] Step 6.4: Two-layer failure retry and idempotency guarantee: Memory-level exponential backoff retries: For events that fail on the first execution, exponential backoff retries are performed in memory. The initial retry interval is 1 second, and the retry interval doubles each time. There are a maximum of 3 retries with a maximum interval of 8 seconds. If the retry is successful, the process terminates; if it fails, it enters the persistent layer for retry.

[0084] Persistent layer timed replay: Events that fail to retry in memory after 3 attempts are written to the database and linked to the field failure log table. The FailedEventRetryScheduler scheduler polls the events to be replayed every 15 seconds and re-executes them in order. The maximum number of retry attempts for a single event is 10. If this number is exceeded, the event is marked as a final failure and a manual alarm is triggered.

[0085] Idempotency Guarantee: All linked operations are idempotent based on the primary key and data version number. Before executing an update, the current version number of the target record is queried. If it is inconsistent with the version number carried by the event, it means that the source data has been changed, and the old event is discarded. When executing the update, the primary key and version number are used as the update condition. After the update is successful, the version number is incremented by 1 to ensure that the same change is not executed repeatedly and to avoid data anomalies caused by retries.

[0086] In this embodiment, the database design follows the convention of naming system tables as BO_business domain_business meaning, fields are uniformly named using lowercase letters and underscores, and primary keys uniformly use 36-bit GUIDs. The core data table structures are shown in Tables 5, 6, 7, 8, 9, and 10.

[0087] Table 5 Trade Route Template Table BO_EU_TRADE_ROUTES

[0088] Table 6 Trade Node Table BO_EU_TRADE_ENTITY

[0089] Table 7 Examples of Trade Routes BO_EU_TRADE_ROUTE_INSTANCE

[0090] Table 8 Trade Instance Sub-Path Table BO_EU_TRADE_INSTANCE_SUB_ROUTE

[0091] Table 9 Sub-path Product Details Table BO_EU_SUB_ROUTE_PRODUCTS

[0092] Table 10 Field Linkage Failure Log Table FIELD_MAPPING_FAILED_LOG

[0093] The following section uses a multi-level transshipment trade route—domestic factory → joint-stock company → free trade zone → Hong Kong → Singapore → overseas customer—to fully illustrate the system's execution process.

[0094] Table 11 Trade Entities Involved

[0095] In this path, the Free Trade Zone Company, the Hong Kong Subsidiary, and the Singapore Subsidiary are all transit parties, but they all have export customs declaration qualifications. Therefore, they are included in the export party node count and participate in the document fission calculation. The system determines the export qualification attribute of the entity role, rather than just the entity type. The business logic is consistent with the data definition.

[0096] The system pre-configures the path R-TR-007: Domestic Factory → Joint-Stock Company → Free Trade Zone → Hong Kong → Singapore → Overseas Customer. The trade mode is multi-level entrepot trade. This path consists of 11 trade nodes connected by predecessor pointers, including 6 trade entity nodes and 5 order entity nodes. The node information is shown in the table below, and the chain structure is shown in Table 12. Table 12 Chain Structure Table

[0097] After accepting a contract order, the business assistant prepares a shipping plan SP-2026-000207 as input data for trade route instantiation. The main table information is shown in Table 13: Table 13 Main Table Information

[0098] The shipment list is shown in Table 14: Table 14 List of Goods for Shipment Plan

[0099] The headquarters customs declaration document officer selects path template R-TR-007 and executes instantiation, generating trade path instance RI-207. During instantiation, the system assigns a completely new instance GUID to each template node, establishes a remapping table, and rewrites the predecessor pointers through a second traversal. The final result is shown in Table 15 below. It can be seen that all node identifiers have been replaced with order-specific instance GUIDs, and the predecessor chain formed by instance GUIDs and preceding instance IDs is completely consistent with the template topology, without any breaks, as shown in Table 15. Table 15 Final Results

[0100] The first producer node, IE-2001, simultaneously carries two production entities, F1 and F2. The actual entity field stores the GUIDs of the two factories in JSON array format. This node is only used for aggregation and display. In the subsequent sub-path splitting stage, it will be split into two independent sub-paths according to the production factory, and all business calculations will be implemented at the sub-path dimension.

[0101] The subsidiary's customs declaration and documentation department splits the shipped goods into two trade sub-paths based on the manufacturer + supplier combination. The system maintains the remaining quantity to be split in real time. After all goods are allocated (1600 → 0), the sub-paths are finally confirmed. Both sub-paths are configured with exclusive discount ratios, which have higher priority than the order-level default discount, as shown in Table 16. Table 16 Final Confirmation Form

[0102] After the main body and sub-paths are determined, the system calculates the price according to the price type of each order entity node. All four price types are applied in this embodiment: IE-2002 internal purchase price: Calculated by calling the SAP purchase order interface, F1 unit price 280 yuan × 1000 pieces + F2 unit price 290 yuan × 600 pieces = 280000 + 174000 = CNY454000.

[0103] IE-2004 Discount Percentage Price: Both sub-paths are configured with exclusive discounts, and the average discount rate is calculated based on the weighted average of the goods value. That is, the weighted discount rate is 91.25%, and the discounted price is 480000 × 0.9125 = CNY438000. The calculation result is written back to the node instance.

[0104] Intercompany prices for IE-2006 and IE-2008: Both segments, Free Trade Zone → Hong Kong and Hong Kong → Singapore, are related transactions within the group. The order SAP net value is CNY 480,000.

[0105] IE-2010 Export Price: The total export price is USD78,000, which is allocated to the goods according to the proportion of the value. P1 is allocated USD48,750 and P2 is allocated USD29,250, with a unit price of USD48.75 per piece.

[0106] The system automatically derives the countries of origin for trade along the trade route: Filter the exporter nodes by serial number, with the largest serial number being the Singapore subsidiary SG (serial number 9). Its downstream neighboring node is actually the Russian customer CU; The initial country of this entity is Russia (RU) when the customer table is queried. The company code for this order's sales organization is 3002, which does not trigger the fixed country-specific coverage rules for Hong Kong and Singapore; the final trade country is automatically determined to be Russia, and no manual input is required throughout the process.

[0107] Once the trading entities and prices are all determined, the system automatically calculates and generates each set of customs declaration documents according to the document splitting rules: Basic Documents: Two sets of basic customs declaration documents are generated from two sub-paths (exporter ① joint-stock company header); Fission Documents: In addition to the joint-stock company, there are three additional exporters in the path: the Free Trade Zone, Hong Kong, and Singapore. Each exporter generates two additional sets of customs declaration documents for its downstream sub-orders. The total number of sets is calculated using the formula: N = 2 × 4 = 8 sets. Specific document information is shown in Table 17 below.

[0108] Table 17 Detailed Document Information Table

[0109] Example of cost allocation calculation: Freight cost allocation: The total freight cost for the first leg is USD 3000, allocated according to the proportion of the gross weight of the goods. The total gross weight of the goods is 20800kg, D1 corresponds to a gross weight of 13000kg, and the allocated freight cost = 3000 × (13000 / 20800) = 1875USD; D2 corresponds to a gross weight of 7800kg, and the allocated freight cost = 3000 × (7800 / 20800) = 1125USD.

[0110] Premium sharing: The insurance rate is 0.3%, and the premium is calculated based on the value of the goods plus 10%. Taking D1 as an example, the premium = 0.003 × 48750 × 1.1 = 160.88 USD, which is consistent with the values ​​in the table.

[0111] Financial Invoice Generation: The last exporter in the path is the Singapore subsidiary. Its downstream export orders need to be issued with financial invoices. Specifically, two financial invoices need to be issued for the IE-2010 node, with amounts of USD48,750 for P1 and USD29,250 for P2.

[0112] This embodiment fully presents the complete processing flow of a multi-level transshipment trade route with four exporters in series. It verifies the feasibility and correctness of core technical solutions such as chain modeling, identifier remapping, automatic pricing, country-specific derivation, and document fission. All calculation results are logically consistent, dimensionally unified, and in line with the actual international trade business.

[0113] The present invention also provides an instantiation linkage system for chain trade paths, wherein the form field linkage engine module further includes: a chain topology directional linkage unit; The chain-type topology directional linkage unit has a built-in chain-type segment transmission rule base, a weight transmission field calculation subunit, a three-segment closed-loop verification subunit, an incremental hierarchical update subunit, and a link tracing subunit. The chain-like segment transmission rule base is used to divide the entire trade path into three mutually coupled transmission segments according to business attributes: main configuration segment, price calculation segment, and document generation segment. Each segment has preset independent change propagation rules and propagation cutoff conditions. Main type changes are coupled downwards along the main segment to the price calculation segment, and then propagated to the document generation segment. Price type changes are only propagated within the price calculation segment and the matching document segment. Each segment achieves coupling and linkage through boundary nodes, forming a coordinated overall linkage system. The weight transmission field calculation subunit is used to preset the linkage weight coefficient for each type of business field of each node on the chain path. Taking the changed node as the origin along the positive transmission direction of the chain, the weight decay value is calculated by combining the node link distance and the field business attribute to construct the chain linkage weight transmission field. Based on the transmission field, all target nodes and fields in the influence domain are prioritized and a hierarchical update queue is generated. Core business fields are updated first with high weight, and auxiliary description fields are processed asynchronously with low weight, so as to realize targeted and precise incremental linkage scheduling. The three-stage closed-loop verification subunit is used to conduct a pre-assessment of the impact domain before the linkage execution, verify whether the change triggers the document compliance threshold, and intercept and output a prompt if there is a compliance risk. During the linkage execution, it monitors the field reconciliation relationship of the target document in real time. When a data consistency deviation occurs, it automatically cuts off the propagation of the branch and records the anomaly. After the linkage is completed, it performs a full-link document data reverse verification, compares the reconciliation consistency of the upstream and downstream node data, automatically corrects the deviation data and writes it back, forming a full closed-loop linkage control of pre-assessment-middle control-post-correction. The incremental hierarchical update subunit is used to perform targeted incremental updates in batches according to priority based on the hierarchical update queue. Before the update, the field protection mark of the target document is identified. Fields that have been manually edited are automatically locked and not overwritten. Only fields that are automatically calculated by the system are refreshed. Fields such as freight and insurance are automatically recalculated according to the allocation rules as the upstream price changes. Non-related fields keep their original values ​​unchanged. The link tracing subunit is used to generate a full-link snapshot of change propagation carrying segment markers, weight coefficients, and node version numbers after each linkage is completed. It records the source change node identifier, transmission segment, weight decay path, affected document identifier, and update field details, and binds and stores them one by one with the corresponding documents. It supports tracing back from any document to the historical version and complete transmission path of the corresponding upstream main node and price node, forming a complete and auditable chain change tracing system. All chained, targeted tasks are uniformly incorporated into the serial processing pipeline of the corresponding path instance, and are executed in an orderly manner strictly according to the submission order. A two-layer failure retry mechanism is used to ensure the eventual consistency of incrementally updated data.

[0114] In this embodiment, the chain segment propagation rule base is a set of rules that are pre-configured and centrally stored to divide the business segments of each trade path and the rules for the propagation of changes. It is used to control the propagation range of changes on the chain path and to achieve automatic truncation of non-related segments.

[0115] The main configuration segment is a set of nodes in a chain-like trade path that carries the basic information of all trading entities. It corresponds to all nodes on the path whose entity type is a trading entity, and serves as the main data source for the entire path. Specifically, a segment label field is added to the node data model. When the system initializes the template, it automatically marks all nodes whose entity type is a trading entity as main configuration segments. Nodes within a segment store basic information such as entity name, qualification attributes, and country of origin. For example, in a multi-level transshipment embodiment, six main nodes—the production plant (A), the domestic joint-stock company, the free trade zone company, the Hong Kong subsidiary, the Singapore subsidiary, and the Russian customer—jointly constitute the main configuration segment.

[0116] The price calculation segment is a set of nodes in a chain-like trade path that carries the logic for calculating transaction prices for each segment. It corresponds to all nodes on the path whose entity type is an order entity. It serves as an intermediate calculation layer for transmitting main data to document data. Specifically, the segment's affiliation is marked by the node's price type attribute. Within each segment, nodes store price data across different dimensions, such as purchase price, discount rate, inter-company price, and export price. For example, in the embodiment, the five order entity nodes corresponding to the internal purchase price, discount rate, inter-company price, and export price collectively constitute the price calculation segment.

[0117] The document generation segment is a set of nodes in the chained trade path that carries all derived business documents. It corresponds to all node segments on the path whose entity type is a document entity, and serves as the final carrier of the link data. Specifically, all commodity inspection, customs declaration, foreign exchange settlement, and invoice document nodes generated through fission are automatically marked as document generation segments. Nodes within the segment store declaration information such as document headers, cargo value, freight, and insurance premiums. For example, in the embodiment, the 8 sets of customs declaration documents and their corresponding foreign exchange settlement document nodes automatically generated together constitute the document generation segment.

[0118] The propagation cutoff condition is a preset rule-based judgment condition. When a change propagates to a node that meets the condition, it automatically stops propagating downstream. This is used to control the scope of the change's impact. Specifically, a rule-based judgment function is built into the boundary node of each segment. When a change propagates to the boundary node, it automatically matches the change type with the node attribute. If the propagation condition is not met, the propagation of the current branch is terminated. For example, when only the inter-company price is modified, the change is only propagated to the corresponding document node that matches the price type. The document node of the export price type automatically triggers the propagation cutoff and does not perform the update, thus avoiding invalid calculations.

[0119] Boundary nodes are shared nodes between two adjacent business segments. They play a role in data coupling and transmission between segments and serve as the data transmission interface between segments. A node that has labels for two segments is a boundary node. For example, the exporter's main node belongs to both the main configuration segment and the starting node for triggering downstream price calculation. When a change is transmitted to the boundary node, it automatically triggers the linkage logic of the next segment.

[0120] The linkage weight coefficient is a pre-set weight value for each type of business field, used to represent the business importance of the field. The higher the value, the higher the priority of the field. That is, the mapping relationship between fields and weights is maintained in the system parameter dictionary table, and the weight level is divided according to the business attributes of the fields. When the system executes linkage, it automatically looks up the table to obtain the basic weight of the corresponding field. For example, the weight coefficient of core declaration fields such as trade country, customs declaration unit price, and commodity quantity is set to 1.0; the weight coefficient of allocation calculation fields such as freight and insurance premium is set to 0.7; and the weight coefficient of auxiliary fields such as internal remarks and derivative numbers is set to 0.3.

[0121] In this embodiment, the link distance is the difference in the sequence numbers of the source node and the target node on the chain path, representing the link level distance between the two nodes. That is, the link distance value is obtained by subtracting the source node sequence number from the target node sequence number based on the sequence number of the changing node. The distance is calculated only in the forward transmission direction and not in the reverse direction. For example, if the sequence number of the changing source node is 3 and the sequence number of a target document node is 9, then the link distance between the two is 6.

[0122] The weight attenuation value is a calculated reduction in weight as the change propagates along the link, increasing with the link distance. The greater the distance, the higher the weight attenuation. This is essentially a preset attenuation coefficient for each link level. The update priority of adjacent nodes and distant nodes is distinguished by the attenuation value. For example, if the base weight of a certain field is 1.0, the link distance is 2, and the attenuation coefficient is 0.9, then the value after weight attenuation is... =0.81.

[0123] The chain-linked weight transmission field is a distribution set consisting of the final weight values ​​of all reachable nodes and their corresponding fields along the forward transmission direction of the chain, with the changed node as the origin. It intuitively presents the degree of impact of the change on each node in the entire chain. That is, by traversing all reachable nodes of the chain path in the forward direction, calculating the final weight value of each target field one by one, a weight mapping table is generated, which forms the transmission field of this change.

[0124] A tiered update queue is a queue of update tasks grouped according to the final weight value of the target field, from highest to lowest. It is used to execute field updates in batches based on priority. Specifically, a weight threshold is set to divide tasks into high, medium, and low priority queues. High-priority queues execute synchronously, medium-priority queues execute with a delay, and low-priority queues execute asynchronously during idle times. Within the same priority level, tasks are executed sequentially according to node number. For example, high-priority queues execute updates to core declaration fields such as trade country and unit price, ensuring real-time consistency of core data; medium-priority queues execute recalculation of freight and insurance premium allocation; and low-priority queues execute updates to remarks and internal statistics fields without affecting the main workflow response speed.

[0125] The impact domain pre-assessment is a preliminary step before the formal data update. It involves traversing and calculating all affected nodes and fields of the change, and performing compliance verification in advance. This means performing a read-only chained forward traversal to calculate only the scope of the impact domain and the results of field changes without writing them to the database. If the verification fails, the change is directly intercepted, a prompt message is returned, and the subsequent update is not performed. For example, if the pre-assessment finds that the trade country of a downstream customs declaration will exceed the business compliance range after modifying the country of origin of a certain entity, the change will be intercepted in advance, and the user will be prompted for confirmation.

[0126] Document compliance thresholds are preset ranges of legal values ​​for document fields and business rule constraints. They serve as the basis for assessing compliance risks during the pre-assessment phase. Specifically, various threshold rules are maintained in the system's compliance rule library according to document type, and configuration is supported by business scenarios. During the pre-assessment, the corresponding rules are automatically matched for comparison. For example, if the customs declaration unit price deviates from the historical average price of similar products by ±30% as a compliance risk threshold, and the new unit price calculated during the pre-assessment exceeds this range, it is determined that there is a compliance risk.

[0127] Field reconciliation relationships are the numerical logical equations that must be satisfied between document data. They serve as the basis for verifying data consistency during the process. That is, a pre-set reconciliation calculation formula is used to verify whether the equation is true in real time after each field update. If the verification fails, the current branch propagation is automatically cut off and the abnormal information is recorded. For example, the sum of the quantity of goods in a single set of documents equals the total quantity of the corresponding sub-path, the sum of the freight costs allocated to all documents equals the total freight, and the unit price of goods multiplied by the quantity equals the total price. These are all examples of field reconciliation relationships.

[0128] End-to-end document data reverse verification is a follow-up step after the linkage execution is completed. Starting from the last document node, it moves backward along the chain path to verify the consistency of upstream and downstream data. That is, starting from the document node, it traverses backward to the corresponding price node and subject node through the predecessor pointer, comparing the matching of upstream and downstream data field by field. If a discrepancy is found, it is automatically corrected and a correction log is recorded. For example, it verifies whether the name of the exporter on the customs declaration is consistent with the name of the upstream exporter subject node, and whether the total customs price is consistent with the price of the corresponding order node, to ensure that the invoice, document, and price data are consistent.

[0129] Field protection markers are identifiers attached to each editable field on a document. They are used to mark whether the field has been manually modified, protecting manually edited content from being overwritten by automatic system updates. That is, each business field in the database corresponds to an identifier field with the same name and a protection suffix. When a user manually modifies a field value, the system automatically sets the corresponding protection marker to an active state. Fields with active markers are skipped during linked updates. For example, if a document officer manually modifies the remarks field of a customs declaration form, the protection marker for that remarks field will automatically take effect, and subsequent linked system updates will not overwrite the manually modified content.

[0130] Fields automatically calculated by the system are those generated entirely by the system through rules and formulas, requiring no manual input and automatically refreshed and overwritten during system updates. Examples include automatically derived trade country, automatically allocated freight and insurance costs, and automatically calculated total price.

[0131] The change propagation full-link snapshot is a complete structured record generated after each targeted linkage is completed. It stores all information such as the source node, propagation path, affected documents, and updated fields of this change. That is, it is stored in the linkage log table in a structured format, including the source change node ID, version number, propagation node sequence, update field details of each target node, execution time, operator and other information.

[0132] Each trade node carries an auto-incrementing version number, which increments by 1 every time the node data undergoes a valid change. This version number identifies different historical versions of the node and is maintained by an optimistic locking mechanism in the database. Each time node data is updated, the primary key plus the current version number is used as the update condition; if the update is successful, the version number increments by 1. The snapshot records the node version number before and after the change. For example, if the initial version number of an exporter's main node is 1, and the version number becomes 2 after the main node name is changed, the current snapshot will record the source node version number as 2, allowing for precise matching of the corresponding historical data.

[0133] The chain-based change tracing system relies on chain-based referencing relationships and propagation snapshots to achieve a complete audit system that traces back from any downstream document to the corresponding upstream entity, price node, and corresponding historical version. That is, starting from the document node, the upstream nodes are traversed in reverse through the predecessor pointer, and the node data of the corresponding historical version is matched with the propagation snapshot to restore the complete change transmission chain.

[0134] The beneficial effects of the above technical solution are as follows: This chain-based topology-oriented linkage solution achieves precise interception of changes by dividing the propagation rules according to business segments, optimizes the linkage response sequence by combining the hierarchical scheduling of the weighted transmission field, and realizes full-process control from compliance interception to consistency correction with three-stage closed-loop verification. Ultimately, without changing the original chain-based data structure, it significantly reduces the overhead of full recalculation triggered by single-node changes and significantly improves the compliance and consistency of trade document data. At the same time, the complete link traceability capability meets the audit traceability requirements of foreign trade business, and the linkage efficiency and data reliability are significantly improved in complex trade path scenarios such as multi-level transshipment.

[0135] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An instantiation and linkage system for a chain-like trade path, characterized in that, include: Trade route template management module, route instantiation processing module, sub-route splitting and document generation module, form field linkage engine module; The trade path template management module is used to construct and store trade path templates. The trade path template is formed by connecting several trade nodes through a predecessor pointer of the preceding entity ID to form a single chain structure. Each trade node carries the attributes of node number, entity type, subject type and price type. The entity type includes three types: trade subject, order entity and document entity, so that the physical trade link and the derived orders and documents are uniformly expressed in the same chain structure. The path instantiation processing module is used to clone the selected trade path template into an order-specific trade path instance during the order shipment process. During instantiation, a new globally unique identifier is assigned to each instance node, a remapping table from template identifier to instance identifier is established, all instance nodes are traversed twice, and the predecessor pointer of each node is rewritten according to the remapping table. The chain reference chain is maintained while the identifier is changed. The sub-path splitting and document generation module is used to split trade sub-paths according to the combination of producers and suppliers, calculate the sub-order price according to the price type corresponding to the node, automatically generate customs declaration, foreign exchange settlement, and financial documents based on the number of sub-paths and the number of exporter nodes, and allocate freight according to the proportion of cargo weight and insurance according to the proportion of cargo value. The form field linkage engine module is used to capture real changes in form fields, match linkage targets based on declarative routing rules, propagate changes to associated forms through an asynchronous ordered pipeline that follows the records sequentially, and ensure eventual data consistency through memory backoff retries and timed replay in the database.

2. The instantiation and linkage system for chain-like trade paths according to claim 1, characterized in that, The main types of the trade nodes include six categories: producers, suppliers, exporters, transit parties, end recipients, and designated recipients. Each main type corresponds to a subdivided main role qualification. When instantiating and selecting an actual trade entity, the available entities are filtered according to the main role preset by the node to ensure that the qualifications of the selected entity match the path design.

3. The instantiation and linkage system for chain-like trade paths according to claim 1, characterized in that, The path instantiation processing module also includes a concurrent anti-duplicate unit and an instance reuse unit; The concurrent anti-duplicate unit uses the template path ID and order ID as unique keys, and rejects duplicate instantiation requests through a dual mechanism of distributed lock and database unique index; The instance reuse unit reuses the original instance ID when the order has generated associated documents, and only updates the node body and price information.

4. The instantiation and linkage system for chain-like trade paths according to claim 1, characterized in that, It also includes an automatic trade country derivation module, which is used to filter the exporter node with the largest sequence number in the path according to the node sequence number, obtain the main body information of the downstream adjacent node of the exporter, query the country to which the main body belongs to obtain the initial trade country, and output the final trade country by superimposing preset business coverage rules.

5. The instantiation linkage system for chain-type trade paths according to claim 1, characterized in that, The sub-path splitting and document generation module supports multiple independent sub-paths under the same combination of producer and supplier, which are distinguished by independent sub-path identifiers. The price types include four categories: internal procurement price, discount percentage, inter-company price, and export price. Each category executes its corresponding calculation logic using a strategy mode. Among them, the internal procurement price supports manual entry of downgrade schemes.

6. The instantiation and linkage system for chain-like trade paths according to claim 1, characterized in that, The fission of single certificates includes: Generate a set of basic customs declaration documents for each trade sub-path; When a node with export customs declaration qualification is added to the corresponding trade sub-path, additional customs declaration documents equal to the number of basic documents are generated for the downstream adjacent sub-orders of that node with export customs declaration qualification. Financial invoices are automatically generated for sub-orders downstream of the last exporter node in the corresponding trade sub-path, with the last exporter node serving as the dividing line.

7. The instantiation linkage system for chain-type trade paths according to claim 1, characterized in that, The form field linkage engine module includes a field change capture unit, a declarative routing unit, an ordered pipeline execution unit, and a failure retry unit. The field change capture unit is used to compare the field-level differences between the old and new values ​​of form data through reflection and annotation, and only publishes a row change event when there is a real change. The declarative routing unit is used to provide chained declarative API configuration linkage rules, supports direct copying of fields and custom calculation assignment, and the rules are matched according to the registration order and support priority configuration. The ordered pipeline execution unit is used to build a serial processing chain for each business document primary key. Changes to the same document are strictly executed in sequence, while different documents are processed in parallel. The failure retry unit employs a two-layer retry mechanism consisting of memory exponential backoff retries and persistent layer timed polling replays. All linked operations are idempotent based on the primary key and data version number.

8. The instantiation linkage system for chain-type trade paths according to claim 1, characterized in that, The chain structure supports adaptation of loop paths and branch paths, wherein: For loop paths: Set a loop identifier field on the trade node to mark the loop attribute. The predecessor pointer of the loop node points to the corresponding upstream node of the path. The node number keeps increasing linearly. After the business layer recognizes the loop identifier, it performs document generation and country deduction according to the loop trade rules. For branch paths: The main chain node is associated with an independent sub-path instance through the branch sub-path ID field. The main chain itself maintains a single-chain topology, and the business logic of the branch path is independently carried by the associated sub-path instance.

Images