Validation rules
BR-O-07 — EN 16931 rule
A document-level charge with VAT category "O" (not subject to VAT) must not carry a VAT rate (BT-103).
- Rule
BR-O-07— official EN 16931 / XRechnung rule- Severity
- error
- Detected by
- tier 3 — KoSIT validator (authoritative)
- Reachability
- Only reachable when validating your own XML — normbill-generated documents cannot trigger it
The serializer never writes a rate for category O, so generated documents always comply.
How to fix it
Remove the Percent element from the charge's TaxCategory in your XML.
BR-O-07 auf Deutsch — was bedeutet der Fehler?
Ein Zuschlag auf Dokumentebene mit der Kategorie "O" (nicht umsatzsteuerbar) darf keinen Steuersatz (BT-103) tragen. normbill schreibt für Kategorie O nie ein Percent; die Meldung betrifft extern erzeugtes XML.
So beheben Sie den Fehler
Entfernen Sie das Percent-Element aus der TaxCategory des Zuschlags in Ihrem XML.
Related rules
BR-O-06— A document-level allowance with VAT category "O" (not subject to VAT) must not carry a VAT rate (BT-96).BR-O-08— The taxable amount (BT-116) of the "not subject to VAT" (O) breakdown does not equal the sum of line net…BR-O-05— A line "not subject to VAT" (O) must not carry a VAT rate.BR-O-09— The tax amount (BT-117) of the "not subject to VAT" (O) breakdown must be 0.BR-O-10— Lines use VAT category "O" (not subject to VAT) but no exemption reason (BT-120) or reason code (BT-121) is…BR-O-04— A document-level charge uses VAT category O ("not subject to VAT"), which forbids a seller VAT identifier…
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.
Or try it live: drop any XRechnung XML on the free validator — same KoSIT-backed report, no account.