Validation rules

UBL-SR-11 — UBL rule

The seller legal registration identifier (BT-30) appears more than once — only one PartyLegalEntity/CompanyID is allowed.

Rule: UBL-SR-11 — 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 legal registration identifier; the serializer never emits this CompanyID.

How to fix it

Keep a single cbc:CompanyID inside the supplier's cac:PartyLegalEntity.

UBL-SR-11 auf Deutsch — was bedeutet der Fehler?

Der KoSIT-Validator lehnt die Rechnung ab, weil die Registernummer des Verkäufers (BT-30) mehrfach vorkommt — nur eine PartyLegalEntity/CompanyID ist erlaubt.

So beheben Sie den Fehler

Behalten Sie genau eine cbc:CompanyID in der cac:PartyLegalEntity des Verkäufers.

Related rules

UBL-SR-10 — The seller trading name (BT-28) appears more than once — the supplier party may carry only one PartyName/Name.
UBL-SR-12 — The seller VAT identifier (BT-31) appears more than once — only one PartyTaxScheme with TaxScheme/ID 'VAT'…
UBL-SR-09 — The seller name (BT-27) appears more than once — the supplier party may carry only one…
UBL-SR-13 — The seller tax registration identifier (BT-32) appears more than once — only one non-VAT PartyTaxScheme may…
UBL-SR-08 — The invoicing period (BG-14) appears more than once — only one document-level cac:InvoicePeriod is allowed.
UBL-SR-14 — The seller's additional legal information (BT-33) appears more than once — only one…

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.