Validation rules

UBL-DT-07

An embedded attachment (cbc:EmbeddedDocumentBinaryObject) is missing its filename attribute — EN 16931 requires a file name for every embedded document (BT-125).

Rule: UBL-DT-07 — official EN 16931 / XRechnung rule
Severity: error
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The request schema requires filename whenever content_base64 is set, and the serializer always writes the filename attribute.

How to fix it

Add filename to the binary object, e.g. filename="rechnung-anlage.pdf".

UBL-DT-07 auf Deutsch — was bedeutet der Fehler?

Der KoSIT-Validator lehnt die Rechnung ab, weil einer eingebetteten Anlage (cbc:EmbeddedDocumentBinaryObject) das filename-Attribut fehlt — EN 16931 verlangt für jedes eingebettete Dokument einen Dateinamen (BT-125).

So beheben Sie den Fehler

Ergänzen Sie filename am Binärobjekt, z. B. filename="rechnung-anlage.pdf".

Official sources

Every 422 from the API lists the rule id, the path in your request JSON, a plain-language message and a suggested fix — see the docs overview for the report format.

Or try it live: drop any XRechnung XML on the free validator — same KoSIT-backed report, no account.