Validation rules

BR-DE-31

Direct-debit information (BG-19) is present but the debited account identifier (BT-91) is missing.

Rule
BR-DE-31 — official EN 16931 / XRechnung rule
Severity
error
Business term
BT-91 — Debited account IBAN
Field in your JSON
invoice.payment.debited_iban

How to fix it

Set invoice.payment.debited_iban to the IBAN that will be charged.

BR-DE-31 auf Deutsch — was bedeutet der Fehler?

Lastschriftangaben (BG-19) sind vorhanden, aber die Kennung des belasteten Kontos (BT-91) fehlt.

So beheben Sie den Fehler

Setzen Sie invoice.payment.debited_iban auf die IBAN, die belastet werden soll.

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.