Message

[UBL-SR-12]-Seller VAT identifier shall occur maximum once

Context
/ubl:Invoice | /cn:CreditNote
Test
(count(cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme[cac:TaxScheme/upper-case(cbc:ID)='VAT']/cbc:CompanyID) <= 1)