Validation rules
UBL-SR-23
The tax representative VAT identifier (BT-63) appears more than once — only one PartyTaxScheme/CompanyID is allowed in the tax representative party.
- Rule
UBL-SR-23— 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 tax representative (BG-11); generated XML never contains cac:TaxRepresentativeParty.
How to fix it
Keep a single CompanyID inside the tax representative's PartyTaxScheme.
UBL-SR-23 auf Deutsch — was bedeutet der Fehler?
Der KoSIT-Validator lehnt die Rechnung ab, weil die USt-IdNr. des Steuervertreters (BT-63) mehrfach vorkommt — nur eine PartyTaxScheme/CompanyID ist erlaubt.
So beheben Sie den Fehler
Behalten Sie genau eine CompanyID im PartyTaxScheme des Steuervertreters.
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.