Validation rules

BR-AG-09

The tax amount (BT-117) of an IPSI (M) breakdown must equal its taxable amount (BT-116) multiplied by its rate (BT-119).

Rule: BR-AG-09 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-117 — VAT category tax amount
Field in your JSON: invoice.lines
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The engine computes tax as taxable × rate with commercial rounding, well inside the rule's tolerance.

How to fix it

Correct the TaxAmount of the IPSI TaxSubtotal in your XML.

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

Der Steuerbetrag (BT-117) einer IPSI-Aufschlüsselung (M) muss dem Grundbetrag (BT-116) multipliziert mit dem Satz (BT-119) entsprechen. normbill berechnet das mit kaufmännischer Rundung; die Meldung betrifft extern erzeugtes XML.

So beheben Sie den Fehler

Korrigieren Sie in Ihrem XML den TaxAmount des IPSI-TaxSubtotal.

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.