BR-31: Each Document level allowance (BG-20) shall have a Document level allowance amount (BT-92)

The rule requires that every document-level allowance (BG-20) also carries a document-level allowance amount (BT-92). It is fatal, so an invoice that does not satisfy it fails validation. In UBL, the allowance is an cac:AllowanceCharge with cbc:ChargeIndicator set to false, and the amount must be present as a child cbc:Amount. In CII, the allowance is a ram:SpecifiedTradeAllowanceCharge whose ram:ChargeIndicator has udt:Indicator = false, and the amount must be present as a sibling ram:ActualAmount. The test checks only that the respective element exists, not its value.

For each document-level allowance, ensure the amount element is present in the XML. In UBL, add a cbc:Amount child inside the cac:AllowanceCharge where cbc:ChargeIndicator is false and populate it with the allowance amount. In CII, add a ram:ActualAmount sibling after the ram:ChargeIndicator whose udt:Indicator is false and populate it with the allowance amount. If an allowance is present but no amount is available, check the source data or mapping: the amount must be supplied as part of the allowance. The rule does not specify a minimum or format for the amount, only that the element exists.