[BR-31-SG]-Each Document level allowance (IBG-20) shall have a Document level allowance amount (IBT-92).
BR-31-SG/ubl:Invoice/cac:AllowanceCharge[cbc:ChargeIndicator = false()] | /cn:CreditNote/cac:AllowanceCharge[cbc:ChargeIndicator = false()]exists(cbc:Amount)