What does BR-01 mean?

Why error BR-01 appears in an e-invoice and how to declare that it follows EN 16931.

BR-01 — Missing specification identifier

What it means

The specification identifier (CustomizationID) is missing — the invoice must declare that it follows the EN 16931 standard. Without this field the validator can't tell which standard to check the rest of the invoice against.

How to fix it

Check that the invoice XML contains a CustomizationID element with the value urn:cen.eu:en16931:2017#compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0 (the Peppol BIS Billing 3.0 profile). If the invoice was produced by accounting software (Jumis, Horizon, 1C, etc.), check whether it has the EN 16931 / Peppol export profile enabled, rather than a plain XML export.

Example

Wrong: the CustomizationID element is missing entirely or empty. Correct: <cbc:CustomizationID>urn:cen.eu:en16931:2017#compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0</cbc:CustomizationID>.