Validation rules

BR-15

The amount due for payment (BT-115) is missing from the document totals.

Rule: BR-15 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-115 — Amount due (computed: BT-112 − BT-113)
Field in your JSON: invoice.totals.gross
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The serializer always writes BT-115. The UBL schema makes cbc:PayableAmount mandatory anyway, so the XSD tier reports hand-built XML without it first.

How to fix it

Add cbc:PayableAmount to cac:LegalMonetaryTotal.

BR-15 auf Deutsch — was bedeutet der Fehler?

Der fällige Zahlbetrag (BT-115) fehlt in den Dokumentsummen.

So beheben Sie den Fehler

Ergänzen Sie cbc:PayableAmount in cac:LegalMonetaryTotal.

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.