Validation rules
NB-EADDR-BUYER
Buyer electronic address (BT-49) is missing — XRechnung requires one for both parties.
- Rule
NB-EADDR-BUYER— normbill pre-flight check (no single official rule id applies)- Severity
- error
- Business term
BT-49— Buyer electronic address- Field in your JSON
invoice.buyer.electronic_address
How to fix it
Set invoice.buyer.electronic_address, or invoice.buyer.contact.email (used as the electronic address).
NB-EADDR-BUYER auf Deutsch — was bedeutet der Fehler?
Die elektronische Adresse des Käufers (BT-49) fehlt — die XRechnung verlangt sie für beide Parteien.
So beheben Sie den Fehler
Setzen Sie invoice.buyer.electronic_address — oder invoice.buyer.contact.email (wird dann als elektronische Adresse verwendet).
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.