An Invoice that contains an Invoice line (BG-25), a Document level allowance (BG-20) or a Document level charge (BG-21) where the VAT category code (BT-151, BT-95 or BT-102) is "Standard rated" shall contain in the VAT breakdown (BG-23) at least one VAT category code (BT-118) equal with "Standard rated".
/ubl:Invoice | /cn:CreditNote((count(//cac:AllowanceCharge/cac:TaxCategory[normalize-space(cbc:ID) = 'S']) + count(//cac:ClassifiedTaxCategory[normalize-space(cbc:ID) = 'S'])) > 0 and count(cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[normalize-space(cbc:ID) = 'S']) > 0) or ((count(//cac:AllowanceCharge/cac:TaxCategory[normalize-space(cbc:ID) = 'S']) + count(//cac:ClassifiedTaxCategory[normalize-space(cbc:ID) = 'S'])) = 0 and count(cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[normalize-space(cbc:ID) = 'S']) = 0)