UBL-SR-09
EN 16931-1 layer: en16931
Checked against Peppol BIS Billing 3.0 2026.5
What does UBL-SR-09 mean? Seller name shall occur maximum once
Why did my invoice fail UBL-SR-09?
The Seller name (BT-27), the full official name under which the seller is registered, may occur at most once. In UBL this is cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName, which must be single-valued.
Official rule text
Seller name shall occur maximum once
Common causes
- Both cac:PartyName and cac:PartyLegalEntity are mapped and the validator sees two seller-name sources.
- Multiple cac:PartyLegalEntity elements are emitted for one seller.
- Registration name is duplicated across trading and legal name mappings.
How do I fix it?
Keep one legal registration name: <cac:PartyLegalEntity><cbc:RegistrationName>ACME Trading Ltd</cbc:RegistrationName></cac:PartyLegalEntity> and remove duplicate seller-name elements.
Related rules
UBL-SR-01 · UBL-SR-02 · UBL-SR-03 · UBL-SR-04 · UBL-SR-05 · UBL-SR-06 · UBL-SR-07 · UBL-SR-08
Check your invoice against this rule
Paste it into the live demo, or call POST /v1/validate. See the quickstart.