Validation rules

UBL-SR-34

An invoice line carries more than one note (BT-127) — only one cbc:Note per cac:InvoiceLine is allowed.

Rule: UBL-SR-34 — 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

The normbill invoice model has no line note; generated lines never contain cbc:Note.

How to fix it

Merge the line notes into a single cbc:Note per line.

UBL-SR-34 auf Deutsch — was bedeutet der Fehler?

Der KoSIT-Validator lehnt die Rechnung ab, weil eine Rechnungsposition mehrere Anmerkungen (BT-127) trägt — nur eine cbc:Note je cac:InvoiceLine ist erlaubt.

So beheben Sie den Fehler

Fassen Sie die Anmerkungen einer Position in einer cbc:Note zusammen.

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.