OPDC API error code

SUBCONTRACT_LINE_NOT_FOUND

HTTP status 422

A line names a subcontract line that is not on the subcontract or has no line reference, or names one with no subcontract on the invoice. 422. Nothing is posted.

The API answers with a problem document (RFC 9457) whose type is https://twinn.engineering/errors/subcontract-line-not-found, and with X-Error-Code: SUBCONTRACT_LINE_NOT_FOUND. Branch on the code, never on the detail text.

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