What the documents look like
Certificates of origin serve import-country tariff and customs clearance purposes. Their preparation basis can come from China International Trade Single Window, CCPIT systems, enterprise production records, and customer clearance requirements, and is not necessarily bound by a letter of credit. In a single shipment, the certificate application, commercial invoice, packing list, and production cost materials each carry different fields. Contract and transaction material comparison must first parse these materials into text chunks that can be traced back to the source, then compare field by field. Materials are produced per shipment and may also be submitted in batches. The quality of parsing and chunking directly determines whether subsequent comparison can locate specific clauses.
The certificate application contains commodity description and origin rule columns. The invoice contains amounts and trade terms. The packing list contains piece counts and gross and net weights. Production cost materials contain components and labor hours. Chunking must follow each structure separately, avoiding splitting conditions, notes, and the content they constrain. Retrieval indexes and original data are stored separately. One group of original data can correspond to multiple indexes. An index hit only indicates textual similarity and does not indicate that the material has been authorized or approved.
Constraints at the document chunking step
Material structures differ substantially. A certificate application includes a commodity description and an origin rule column. An invoice includes amount and trade term fields. A packing list includes piece counts and gross and net weights. Production cost materials include components and labor hours. Chunking must follow each structure separately so that conditions, notes, and the content they constrain remain together. Retrieval indexes and original data are stored separately, and one group of original data can map to multiple indexes. An index hit indicates textual similarity only. It does not indicate that the material has been authorized or approved.
Hypothetical paper exercise sample: A company submits a commercial invoice whose source text reads "Invoice No. INV-2401, issue date March 5, 2024, goods are aluminum alloy door and window fittings, quantity 1,200 pieces, unit price USD 4.50, trade term FOB Shanghai." A separate certificate of origin application draft reads "Country of origin: China; FOB value: USD 5,400; Invoice No.: INV-2401." The draft sentence to be assessed is "The FOB value of this batch is consistent with the invoice and can be submitted for declaration." Verification must confirm whether the two materials refer to the same shipment by commodity, quantity, and amount. The draft remains unsigned and unsubmitted, in a pending-review state.
Configuration and implementation checks
| Configuration or check item | Hypothetical starting point for this exercise | Reason for selection and comparison method |
|---|---|---|
| Search mode | Hybrid retrieval | Invoice number and amount are exact fields; commodity description is natural language. Compare hit results against semantic retrieval alone. |
| Reference limit | Hypothetical starting point 3000 tokens | Accommodates invoice and packing list fragments. Compare against a smaller value to check whether key fields are truncated. |
| Minimum relevance | Hypothetical starting point 0.3 | Compare against 0.5 to observe whether low-relevance fragments are filtered. |
| Chunk granularity | Split by invoice, packing list, and cost material structure separately | Compare against treating the whole document as one block to check whether conditions and constraints are split apart. |
| Training status check | After upload, check actual training and index status | Compare against checking upload success alone to confirm whether retrieval has updated. |
| Authorization boundary check | Retrieval and forms collect and present only | Record separately from approval, signing, and declaration submission. Do not treat a retrieval hit as authorization. |
Three common errors
- Treating a retrieval hit as authorization or a completed declaration. An invoice fragment being recalled only indicates textual similarity. The draft remains in pending review, unsigned and unsubmitted, and does not constitute a declaration action.
- Treating different fields as the same field for comparison. If the invoice amount and the application draft FOB value use different bases, first confirm whether they share the same subject, period, and field. When not stated, record as pending verification.
- Treating upload success as index update. After material changes, check actual training and index status. Upload success and retrieval availability are two separate matters.
How to verify the setup
- Input the invoice source text and the draft sentence above. Compare whether commodity, quantity, amount, and invoice number point to the same shipment. When the same field in both materials has clearly mutually exclusive values, record as a contradiction. When not stated or only related-stage evidence exists, record as unsupported or pending verification.
- Use invoice number INV-2401 for full-text retrieval and "aluminum alloy door and window fittings" for semantic retrieval. Observe whether returned fragments trace back to the source. If an empty result is returned, record as no hit. Do not infer that the rule necessarily returns empty.
- Check the draft authorization status. Pending review does not prove lack of operating permission. Signing, cooperation reached, and contract effectiveness are three distinct facts. Record the current status as pending review, retain the evidence gap, and do not fabricate authorization or effectiveness clauses.