Validation rules

BR-12

The sum of invoice line net amounts (BT-106) is missing from the document totals.

Rule: BR-12 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-106 — Sum of line net amounts
Field in your JSON: invoice.totals.net
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

normbill computes every monetary total itself and always writes BT-106; supplied invoice.totals are only cross-checked, never serialized.

How to fix it

Add cbc:LineExtensionAmount to cac:LegalMonetaryTotal.

BR-12 auf Deutsch — was bedeutet der Fehler?

Die Summe der Positionsnettobeträge (BT-106) fehlt in den Dokumentsummen.

So beheben Sie den Fehler

Ergänzen Sie cbc:LineExtensionAmount 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.