Validation rules
NB-IBAN-CHECKSUM
The IBAN fails its checksum — this is almost certainly a typo.
- Rule
NB-IBAN-CHECKSUM— normbill pre-flight check (no single official rule id applies)- Severity
- warning
- Business term
BT-84— Payment account IBAN- Field in your JSON
invoice.payment.iban
How to fix it
Double-check invoice.payment.iban or invoice.payment.debited_iban against your bank details.
NB-IBAN-CHECKSUM auf Deutsch — was bedeutet der Fehler?
Die IBAN besteht die Prüfziffernkontrolle nicht — mit hoher Wahrscheinlichkeit ein Tippfehler.
So beheben Sie den Fehler
Gleichen Sie invoice.payment.iban oder invoice.payment.debited_iban mit Ihren Bankdaten ab.
NB-* checks run before generation to catch problems the official rule set would only report indirectly. The authoritative KoSIT validation still has the final word on conformance.
Official sources
- XRechnung specification (KoSIT / xeinkauf.de)
- KoSIT validator on GitHub and the XRechnung validator configuration
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.