BR-47
Each VAT breakdown (BG-23) shall be defined through a VAT category code (BT-118).
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.
cac:TaxTotal/cac:TaxSubtotal
exists(cac:TaxCategory[cac:TaxScheme/normalize-space(upper-case(cbc:ID))='VAT']/cbc:ID)
Checked with EN 16931 Invoice (UBL), EN 16931 Credit Note (UBL), Croatia eRačun Invoice (UBL), Croatia eRačun Credit Note (UBL)
//ram:ApplicableHeaderTradeSettlement/ram:ApplicableTradeTax
(.[upper-case(ram:TypeCode) = 'VAT']/ram:CategoryCode)
Checked with EN 16931 Invoice (CII)
//ram:ApplicableHeaderTradeSettlement/ram:ApplicableTradeTax
(ram:CategoryCode)
Checked with France Factur-X BASIC WL, Factur-X / ZUGFeRD BASIC WL