BR-56

Each Seller tax representative party (BG-11) shall have a Seller tax representative VAT identifier (BT-63).

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What the rule checks

As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.

Context
cac:TaxRepresentativeParty
Test
exists(cac:PartyTaxScheme[cac:TaxScheme/(normalize-space(upper-case(cbc:ID)) = 'VAT')]/cbc:CompanyID)

Checked with EN 16931 Invoice (UBL), EN 16931 Credit Note (UBL), Croatia eRačun Invoice (UBL), Croatia eRačun Credit Note (UBL)

Context
//ram:SellerTaxRepresentativeTradeParty
Test
normalize-space(ram:SpecifiedTaxRegistration/ram:ID[@schemeID='VA']) != ''

Checked with EN 16931 Invoice (CII)

Context
//ram:SellerTaxRepresentativeTradeParty
Test
(ram:SpecifiedTaxRegistration/ram:ID[@schemeID='VA']!='')

Checked with France Factur-X BASIC WL, Factur-X / ZUGFeRD BASIC WL