fatalEN 16931syntax binding ruleUBL
Seller tax representative VAT identifier shall occur maximum once, if the Seller has a tax representative
An element that EN 16931 allows at most once appears more than once: Seller tax representative VAT identifier shall occur maximum once, if the Seller has a tax representative
Keep the single correct occurrence and delete the rest. If you genuinely have several values, they belong in a repeatable group, not in repeated elements.
UBL — context cac:TaxRepresentativeParty
(count(cac:PartyTaxScheme/cbc:CompanyID) <= 1)