Validation rules
BR-CO-18 — EN 16931 rule
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).
Related rules
BR-CO-17— A VAT breakdown's tax amount (BT-117) does not equal its taxable amount (BT-116) multiplied by the category…BR-CO-19— An invoicing period (BG-14) is present but carries neither a start date (BT-73) nor an end date (BT-74).BR-CO-16— The amount due (BT-115) must equal the invoice total with VAT (BT-112) minus the paid amount (BT-113), plus…BR-CO-20— An invoice line period (BG-26) is present but carries neither a start date (BT-134) nor an end date (BT-135).BR-CO-15— Supplied totals.gross does not equal net + tax.BR-CO-21— A document-level allowance (BG-20) carries neither a reason text (BT-97) nor a reason code (BT-98) — at…
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.