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BR-AA-02

An Invoice that contains an Invoice line (BG-25) where the Invoiced item VAT category code (BT-151) is “Lower rate” shall contain the Seller VAT Identifier (BT-31), the Seller tax registration identifier (BT-32) and/or the Seller tax representative VAT identifier (BT-63).

error: the document is invalid

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.

CIUS-PT rules (Portugal, UBL) 2.1.1
Context
//ubl:Invoice | //cn:CreditNote
Test
(exists(//cac:ClassifiedTaxCategory[(normalize-space(cbc:ID) = 'AA' or normalize-space(cbc:ID) = 'RED' or normalize-space(cbc:ID) = 'INT')]) and (exists(//cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme/cbc:CompanyID) or exists(//cac:TaxRepresentativeParty/cac:PartyTaxScheme[cac:TaxScheme/cbc:ID = 'VAT']/cbc:CompanyID))) or not(exists(//cac:ClassifiedTaxCategory[(normalize-space(cbc:ID) = 'AA' or normalize-space(cbc:ID) = 'RED' or normalize-space(cbc:ID) = 'INT')]))

Checked with Portugal CIUS-PT Invoice (UBL), Portugal CIUS-PT Credit Note (UBL)