Validation rules

BR-16

The invoice has no invoice lines (BG-25) — at least one is required.

Rule: BR-16 — official EN 16931 / XRechnung rule
Severity: error
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

invoice.lines requires at least one entry in the request schema; the UBL schema also mandates one, so the XSD tier reports line-less XML first.

How to fix it

Add at least one cac:InvoiceLine.

BR-16 auf Deutsch — was bedeutet der Fehler?

Die Rechnung enthält keine Rechnungspositionen (BG-25) — mindestens eine ist Pflicht.

So beheben Sie den Fehler

Ergänzen Sie mindestens eine cac:InvoiceLine.

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.