Validation rules
UBL-SR-15
The buyer name (BT-44) appears more than once — the customer party may carry only one PartyLegalEntity/RegistrationName.
- Rule
UBL-SR-15— official EN 16931 / XRechnung rule- Severity
- error
- Business term
BT-44— Buyer name- Field in your JSON
invoice.buyer.name- Detected by
- tier 3 — KoSIT validator (authoritative)
- Reachability
- Only reachable when validating your own XML — normbill-generated documents cannot trigger it
The serializer writes invoice.buyer.name as exactly one RegistrationName.
How to fix it
Keep a single cac:PartyLegalEntity/cbc:RegistrationName under cac:AccountingCustomerParty.
UBL-SR-15 auf Deutsch — was bedeutet der Fehler?
Der KoSIT-Validator lehnt die Rechnung ab, weil der Käufername (BT-44) mehrfach vorkommt — die Käuferpartei darf nur einen PartyLegalEntity/RegistrationName tragen.
So beheben Sie den Fehler
Behalten Sie genau einen cac:PartyLegalEntity/cbc:RegistrationName unter cac:AccountingCustomerParty.
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.