UBL-SR-15
EN 16931-1 layer: en16931
Checked against Peppol BIS Billing 3.0 2026.5
What does UBL-SR-15 mean? Buyer name shall occur maximum once
Why did my invoice fail UBL-SR-15?
The Buyer name (BT-44), the full name under which the buyer is known, may occur at most once. In UBL this is cac:AccountingCustomerParty/cac:Party/cac:PartyName/cbc:Name, which must be single-valued.
Official rule text
Buyer name shall occur maximum once
Common causes
- Multiple cac:PartyName elements are emitted for the buyer (e.g. legal and trading names both under PartyName).
- Buyer name is duplicated from both a customer-master name and an order contact name.
- Template loops over buyer aliases and outputs each as a PartyName.
How do I fix it?
Provide a single buyer name: <cac:AccountingCustomerParty><cac:Party><cac:PartyName><cbc:Name>Buyer Corp GmbH</cbc:Name></cac:PartyName></cac:Party></cac:AccountingCustomerParty> and remove extra cac:PartyName 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.