[IBR-042-OM] - If Document level charge (IBG-21) is present, document level charge reason code MUST be present.
IBR-042-OMubl:Invoice/cac:AllowanceCharge[cbc:ChargeIndicator = 'true'] | cn:CreditNote/cac:AllowanceCharge[cbc:ChargeIndicator = 'true']cbc:AllowanceChargeReasonCode