Message

An invoice MUST have a seller name and/or a seller identifier

Context
/ubl:Invoice
Test
(cac:AccountingSupplierParty/cac:Party/cac:PartyName/cbc:Name) or (cac:AccountingSupplierParty/cac:Party/cac:PartyIdentification/cbc:ID)
Usage
/ ubl:Invoice / cac:AccountingSupplierParty / cac:Party / cac:PartyIdentification / cbc:ID
/ ubl:Invoice / cac:AccountingSupplierParty / cac:Party / cac:PartyName / cbc:Name