[IBR-069-OM] - A VAT breakdown (IBG-23) with VAT category code (IBT-118) 'E' (Exempt) or 'Z' (Zero rated) MUST have a VAT exemption reason code (IBT-121).
IBR-069-OMubl:Invoice/cac:TaxTotal/cac:TaxSubtotal | cn:CreditNote/cac:TaxTotal/cac:TaxSubtotalnot($vatCategory='E' or $vatCategory='Z') or cac:TaxCategory/cbc:TaxExemptionReasonCode