Validation rules

UBL-SR-35

An invoice line references more than one purchase order line (BT-132) — only one OrderLineReference/LineID per line is allowed.

Rule: UBL-SR-35 — 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 order line reference; generated lines never contain cac:OrderLineReference.

How to fix it

Keep a single cac:OrderLineReference/cbc:LineID per invoice line.

UBL-SR-35 auf Deutsch — was bedeutet der Fehler?

Der KoSIT-Validator lehnt die Rechnung ab, weil eine Position auf mehrere Bestellpositionen (BT-132) verweist — nur eine OrderLineReference/LineID je Position ist erlaubt.

So beheben Sie den Fehler

Behalten Sie genau eine cac:OrderLineReference/cbc:LineID je Rechnungsposition.

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.