OPDC API error code

PERIOD_UNRESOLVED

HTTP status 422

A posting date that could not be resolved to a period or year at all. 422.

The API answers with a problem document (RFC 9457) whose type is https://twinn.engineering/errors/period-unresolved, and with X-Error-Code: PERIOD_UNRESOLVED. Branch on the code, never on the detail text.

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