EN16931 1.3.16 · UBL / CII · Severity: ERROR
An Invoice shall have a Seller name (BT-27)
The formal legal registration name of the seller (BT-27) must be present.
- Rule ID & Severity
BR-06· ERROR- Standard & Scope
- EN16931 1.3.16 · UBL / CII
- XPath Condition
exists(cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName)- Target XML Path
cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName
Find the source field
cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName
Match namespace URI and element name, not a particular prefix spelling. The validator reports the full expanded-name source path when the published rule supplies a location.
Common causes
- Seller name was placed in cac:PartyName/cbc:Name (BT-28 trading name) while omitting cac:PartyLegalEntity/cbc:RegistrationName (BT-27).
Invalid and corrected fragments
<cac:PartyName><cbc:Name>Trading Name Only</cbc:Name></cac:PartyName>
<cac:PartyLegalEntity><cbc:RegistrationName>Fictional Seller GmbH</cbc:RegistrationName></cac:PartyLegalEntity>
Populate cac:PartyLegalEntity/cbc:RegistrationName with the seller’s official registered company name.
Open BR-06 in en16931-validator →
Verify the whole document
These are fragments, not complete invoices. The exact rule is exercised by synthetic mutation tests against the stated package. Correcting one field does not prove conformance; run the full selected validator again. Published messages and severity remain authoritative.
Explanation record: 2026-10-14 · Local WebAssembly / SaxonJS validation. No invoice-derived report is published as a search page.