Validation rules
BR-CO-18
The invoice has no VAT breakdown (BG-23) — at least one is required.
- Rule
BR-CO-18— 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 engine always emits one VAT breakdown per category/rate group used by the lines.
How to fix it
Add cac:TaxTotal with at least one cac:TaxSubtotal (taxable amount, tax amount, category).
BR-CO-18 auf Deutsch — was bedeutet der Fehler?
Die Rechnung enthält keine Umsatzsteueraufschlüsselung (BG-23) — mindestens eine ist Pflicht.
So beheben Sie den Fehler
Ergänzen Sie cac:TaxTotal mit mindestens einem cac:TaxSubtotal (Basisbetrag, Steuerbetrag, Kategorie).
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.