BR-31: Document level allowance amount (BT-92) is required

ExampleEN 16931 (UBL)

An invoice built like a valid one, except for this:

<cac:AllowanceCharge>
  <cbc:ChargeIndicator>false</cbc:ChargeIndicator>
  <cbc:AllowanceChargeReason>Volume discount</cbc:AllowanceChargeReason>
  <cac:TaxCategory>
    <cbc:ID>S</cbc:ID>
    <cbc:Percent>19.00</cbc:Percent>
    <cac:TaxScheme>
      <cbc:ID>VAT</cbc:ID>
    </cac:TaxScheme>
  </cac:TaxCategory>
</cac:AllowanceCharge>

The validator says: Document level allowance amount (BT-92) is required and the document does not contain it.

How to fix it

Add Document level allowance amount to the invoice.

Frequently asked questions

What does BR-31 mean?

Document level allowance amount (BT-92) is required. The rule runs under EN 16931 (UBL), Peppol BIS 3.0, and XRechnung 3.0 (UBL).

How do I fix BR-31?

Add Document level allowance amount to the invoice. In UBL the element is /Invoice/cac:AllowanceCharge[cbc:ChargeIndicator=false]/cbc:Amount.