BR-24: Invoice line net amount (BT-131) is required

ExampleEN 16931 (UBL)

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

<cac:InvoiceLine>
  <cbc:ID>1</cbc:ID>
  <cbc:InvoicedQuantity unitCode="H87">1</cbc:InvoicedQuantity>
  <cac:Item>
    <cbc:Name>Widget</cbc:Name>
    <cac:ClassifiedTaxCategory>
      <cbc:ID>S</cbc:ID>
      <cbc:Percent>19.00</cbc:Percent>
      <cac:TaxScheme>
        <cbc:ID>VAT</cbc:ID>
      </cac:TaxScheme>
    </cac:ClassifiedTaxCategory>
  </cac:Item>
  <cac:Price>
    <cbc:PriceAmount currencyID="EUR">100.00</cbc:PriceAmount>
  </cac:Price>
</cac:InvoiceLine>

The validator says: Invoice line net amount (BT-131) is required and the document does not contain it.

Official validation message

This is the official EN 16931 validation message for this rule, quoted verbatim in English from the validation artefacts below. It is not translated: a translation would no longer be the official text.

[BR-24]-Each Invoice line (BG-25) shall have an Invoice line net amount (BT-131).

Quoted verbatim and unmodified from the official EN 16931 validation artefacts published by CEN/TC 434, release validation-1.3.16 of April 13, 2026, licensed under the European Union Public Licence v. 1.2. Provided without warranty of any kind, including as to accuracy. Source and licence →

How to fix it

Add Invoice line net amount to the invoice.

Frequently asked questions

What does BR-24 mean?

Invoice line net amount (BT-131) is required. The rule runs under EN 16931 (UBL), Peppol BIS 3.0, and XRechnung 3.0 (UBL).

How do I fix BR-24?

Add Invoice line net amount to the invoice. In UBL the element is ⁦/Invoice/cac:InvoiceLine/cbc:LineExtensionAmount⁩.