Validation rules

BR-50

A credit-transfer payment account is present but its account identifier (IBAN, BT-84) is empty.

Rule: BR-50 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-84 — Payment account IBAN
Field in your JSON: invoice.payment.iban
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The serializer only writes the account group when invoice.payment.iban is set (min. 15 characters), so generated documents never carry an empty BT-84.

How to fix it

Put the IBAN (or other account identifier) into cac:PayeeFinancialAccount/cbc:ID.

BR-50 auf Deutsch — was bedeutet der Fehler?

Ein Überweisungskonto ist angegeben, aber die Kontokennung (IBAN, BT-84) ist leer.

So beheben Sie den Fehler

Tragen Sie die IBAN (oder andere Kontokennung) in cac:PayeeFinancialAccount/cbc:ID ein.

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.