OPDC API error code

SERVICE_INVOICE_NOT_POSTABLE

HTTP status 422

A service invoice whose totals or status do not permit a GL post. 422.

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

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