[ALIGNED-IBRP-S-10-OM] - A VAT breakdown (IBG-23) with VAT Category code (IBT-118) "S" MUST not have a VAT exemption reason code (IBT-121) or VAT exemption reason text (IBT-120).
ALIGNED-IBRP-S-10-OMubl:Invoice/cac:TaxTotal/cac:TaxSubtotal | cn:CreditNote/cac:TaxTotal/cac:TaxSubtotalnot($vatCategory='S') or (not(cac:TaxCategory/cbc:TaxExemptionReasonCode) and not(cac:TaxCategory/cbc:TaxExemptionReason))