Validation rules

BR-26

An invoice line has no item net price (BT-146).

Rule: BR-26 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-146 — Item net price
Field in your JSON: invoice.lines[*].unit_price
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The request schema requires line.unit_price (>= 0).

How to fix it

Add cac:Price/cbc:PriceAmount to the line.

BR-26 auf Deutsch — was bedeutet der Fehler?

Eine Rechnungsposition hat keinen Netto-Einzelpreis (BT-146).

So beheben Sie den Fehler

Ergänzen Sie cac:Price/cbc:PriceAmount in der Position.

Official sources

XRechnung specification (KoSIT / xeinkauf.de)
KoSIT validator on GitHub and the XRechnung validator configuration

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.