Validation rules

BR-DEX-09

In the Extension, the amount due (BT-115) must equal total with VAT (BT-112) − paid (BT-113) + rounding (BT-114) + the sum of third-party payment amounts.

Rule: BR-DEX-09 — 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

Recompute the payable amount including third-party payments.

BR-DEX-09 auf Deutsch — was bedeutet der Fehler?

In der Extension gilt: fälliger Betrag (BT-115) = Gesamtbetrag mit USt (BT-112) − gezahlt (BT-113) + Rundung (BT-114) + Summe der Fremdforderungsbeträge. Diese Regel gehört zur „Extension XRechnung“; normbill erzeugt die reguläre CIUS.

So beheben Sie den Fehler

Berechnen Sie den fälligen Betrag inklusive Fremdforderungen neu.

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.