Validation rules

BR-24 — EN 16931 rule

An invoice line has no line net amount (BT-131).

Rule: BR-24 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-131 — Line net 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 BT-131 for every line (qty × unit_price, adjusted by line allowances/charges). The UBL schema makes the element mandatory anyway, so the XSD tier reports hand-built XML without it first.

How to fix it

Add cbc:LineExtensionAmount to the line.

BR-24 auf Deutsch — was bedeutet der Fehler?

Eine Rechnungsposition hat keinen Positionsnettobetrag (BT-131).

So beheben Sie den Fehler

Ergänzen Sie cbc:LineExtensionAmount in der Position.

Related rules

BR-DEC-23 — An invoice line net amount (BT-131) uses more than 2 decimal places — EN 16931 allows at most 2.
PEPPOL-EN16931-R120 — An invoice line net amount must equal quantity × (price / base quantity) plus line charges minus line…
BR-23 — An invoiced quantity has no unit of measure code (BT-130).
BR-25 — An invoice line has no item name (BT-153).
BR-22 — An invoice line has no invoiced quantity (BT-129).
BR-26 — An invoice line has no item net price (BT-146).

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.