ERP and API to eCoC: define the data contract before connecting systems
An ERP-to-eCoC integration should answer who owns each value, when it becomes final and how a rejected or corrected record returns to its source. Connecting two APIs does not settle those questions. Start with one vehicle family and one certificate flow so the mapping can be tested against real manufacturer records.
1. Identify systems of record
List vehicle identity, approval reference, type/variant/version, production values and completion-stage data separately. For each, name the authoritative system and the person who can approve a correction. A source field's name is not evidence that its value is fit for an eCoC; confirm meaning, units, revision and applicability.
2. Agree on a field contract
Document destination concept, source field, transformation, requiredness, conditional rule, owning team and error action. Keep the actual IVI/XSD element names in a versioned implementation mapping. A generic example should never be mistaken for the current regulatory schema.
3. Plan retries and corrections
Give each source record a stable identifier and revision. Agree what happens when the same message is retried, when a newer revision arrives after review, or when a downstream check rejects a value. Preserve a trace from the certificate candidate to the source revision and mapping version. The receiver should return actionable errors rather than silently substituting data.
4. Validate the end-to-end handoff
Test one complete record and known failures. Compare the generated candidate with the approved source, rerun after corrections and confirm which team owns the final release decision. Digital CoC supports manufacturer-side preparation and workflow visibility; the exact connector and authority route require project-specific verification.
A small, testable field contract
For a pilot, define one table with destination concept, source system and field, data type, transformation, approval owner and failure action. A fictitious mapping might assign VIN to a production record, type-approval reference to the homologation register and completion-stage data to the responsible stage owner. Do not copy a value from another vehicle just because the destination field is required.
Send a stable source-record identifier and revision with each import. If the same revision is retried, the receiver should avoid creating a second certificate draft; if a later revision arrives, it should enter review rather than silently replace approved values. Record rejected values, source and reason so a person can correct the upstream system. These are recommended contract controls to agree in the pilot, not a promise about a particular API endpoint.
Test missing VIN, stale approval reference, duplicate delivery and a changed source value after XML generation. Then decide which system owns each correction and whether the XML candidate must be regenerated. The regulatory background is the manufacturer's obligation to provide correct structured CoC data; the integration architecture remains a manufacturer-specific design choice.