Validation rules
UBL-SR-13 — UBL rule
The seller tax registration identifier (BT-32) appears more than once — only one non-VAT PartyTaxScheme may carry a CompanyID.
- Rule
UBL-SR-13— official EN 16931 / XRechnung rule- Severity
- error
- Business term
BT-32— Seller tax registration- Field in your JSON
invoice.seller.tax_number- Detected by
- tier 3 — KoSIT validator (authoritative)
- Reachability
- Only reachable when validating your own XML — normbill-generated documents cannot trigger it
The serializer emits at most one FC PartyTaxScheme, from invoice.seller.tax_number.
How to fix it
Keep a single non-VAT PartyTaxScheme (TaxScheme/ID 'FC') on the supplier party. Through normbill, invoice.seller.tax_number is a single value.
UBL-SR-13 auf Deutsch — was bedeutet der Fehler?
Der KoSIT-Validator lehnt die Rechnung ab, weil die Steuernummer des Verkäufers (BT-32) mehrfach vorkommt — nur ein PartyTaxScheme ohne VAT-Schema darf eine CompanyID tragen.
So beheben Sie den Fehler
Behalten Sie genau ein Nicht-VAT-PartyTaxScheme (TaxScheme/ID „FC“) beim Verkäufer. Über normbill ist invoice.seller.tax_number ein einzelner Wert.
Related rules
UBL-SR-12— The seller VAT identifier (BT-31) appears more than once — only one PartyTaxScheme with TaxScheme/ID 'VAT'…UBL-SR-14— The seller's additional legal information (BT-33) appears more than once — only one…UBL-SR-11— The seller legal registration identifier (BT-30) appears more than once — only one…UBL-SR-15— The buyer name (BT-44) appears more than once — the customer party may carry only one…UBL-SR-10— The seller trading name (BT-28) appears more than once — the supplier party may carry only one PartyName/Name.UBL-SR-16— The buyer identifier (BT-46) appears more than once — the customer party may carry only one…
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.
Or try it live: drop any XRechnung XML on the free validator — same KoSIT-backed report, no account.