Validation rules

BR-DEX-12 — XRechnung rule

A third-party payment group must state the payment description.

Rule: BR-DEX-12 — 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

Belongs to the 'Extension XRechnung' CustomizationID. normbill generates the plain CIUS, never the Extension — reachable only for Extension XML submitted to /v1/invoices/validate.

How to fix it

Add the third-party payment description.

BR-DEX-12 auf Deutsch — was bedeutet der Fehler?

Eine Fremdforderungsgruppe muss die Beschreibung nennen. Diese Regel gehört zur „Extension XRechnung“; normbill erzeugt die reguläre CIUS.

So beheben Sie den Fehler

Ergänzen Sie die Beschreibung der Fremdforderung.

Related rules

BR-DEX-11 — A third-party payment group must state the payment amount.
BR-DEX-13 — A third-party payment amount may carry at most 2 decimal places.
BR-DEX-10 — A third-party payment group must state the payment type.
BR-DEX-14 — A third-party payment amount must use the invoice currency (BT-5) as its currency.
BR-DEX-09 — In the Extension, the amount due (BT-115) must equal total with VAT (BT-112) − paid (BT-113) + rounding…
BR-DEX-15 — This CII document appears to use sub-invoice lines, which XRechnung does not support in this syntax.

Official sources

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.