BR-KSA-12
A Document level allowance (BG-20) where VAT category code (BT-95) is "Not subject to VAT", a Document level allowance VAT rate (BT-96) shall be 0 (Zero), if exist.
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:AllowanceCharge/cbc:MultiplierFactorNumeric | cac:InvoiceLine/cac:AllowanceCharge/cbc:MultiplierFactorNumeric
not(cbc:Percent)
Checked with Saudi Arabia ZATCA Tax Invoice (UBL), Saudi Arabia ZATCA Simplified Tax Invoice (UBL)