FX-SCH-A-000084
In a Document level allowance (BG-20) where the Document level allowance VAT category code (BT-95) is "Exempt from VAT", the Document level allowance VAT rate (BT-96) shall be 0 (zero).
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.
[BR-E-06] In a Document level allowance (BG-20) where the Document level allowance VAT category code (BT-95) is "Exempt from VAT", the Document level allowance VAT rate (BT-96) shall be 0 (zero).
//ram:SpecifiedTradeAllowanceCharge[ram:ChargeIndicator/udt:Indicator='false']/ram:CategoryTradeTax[ram:CategoryCode = 'E']
ram:RateApplicablePercent = 0
Checked with Factur-X / ZUGFeRD MINIMUM