fatalEN 16931EN 16931 business ruleCIIUBLBG-20BT-95BT-96
In a Document level allowance (BG-20) where the Document level allowance VAT category code (BT-95) is "Reverse charge" the Document level allowance VAT rate (BT-96) shall be 0 (zero).
A document level allowance with VAT category Reverse charge (AE) has a VAT rate (BT-96) that is not allowed: it must be exactly 0.
Set the rate to 0. Under reverse charge the buyer accounts for the VAT, so you charge none. Or change the allowance's category code so the two agree.
CII — context $VATAE_Allowance
ram:RateApplicablePercent = 0
UBL — context cac:AllowanceCharge[cbc:ChargeIndicator=false()]/cac:TaxCategory[normalize-space(cbc:ID)='AE'][cac:TaxScheme/normalize-space(upper-case(cbc:ID))='VAT']
(xs:decimal(cbc:Percent) = 0)