Validation rules
BR-02
The invoice number (BT-1) is missing or empty.
- Rule
BR-02— official EN 16931 / XRechnung rule- Severity
- error
- Business term
BT-1— Invoice number- Field in your JSON
invoice.number- Detected by
- tier 3 — KoSIT validator (authoritative)
- Reachability
- Only reachable when validating your own XML — normbill-generated documents cannot trigger it
The request schema requires invoice.number (BT-1), so generated documents always carry it.
How to fix it
Set a non-empty cbc:ID directly under the invoice root.
BR-02 auf Deutsch — was bedeutet der Fehler?
Die Rechnungsnummer (BT-1) fehlt oder ist leer.
So beheben Sie den Fehler
Setzen Sie eine nicht-leere cbc:ID direkt unter der Rechnungswurzel.
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.