Validation rules

UBL-SR-54

More than one payment card account (BG-18) is present — cac:PaymentMeans/cac:CardAccount is allowed at most once.

Rule: UBL-SR-54 — 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 normbill invoice model has no card payments; generated XML never contains cac:CardAccount.

How to fix it

Keep a single CardAccount in the document.

UBL-SR-54 auf Deutsch — was bedeutet der Fehler?

Der KoSIT-Validator lehnt die Rechnung ab, weil mehrere Zahlungskarten-Informationen (BG-18) vorhanden sind — cac:PaymentMeans/cac:CardAccount ist höchstens einmal erlaubt.

So beheben Sie den Fehler

Behalten Sie genau ein CardAccount im Dokument.

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.