Peppol BIS Billing 3.0 · rule

UBL-CR-679

Layer en16931·Checked against Peppol BIS Billing 3.0 2026.5

What does UBL-CR-679 mean? A UBL invoice should not include the ClassifiedTaxCategory/ID schemeID

Why did my invoice fail UBL-CR-679?

The schemeID attribute on cac:ClassifiedTaxCategory/cbc:ID (the line-level VAT category code, BT-151) should not be used. EN 16931 defines this as a bare UNCL5305 code with no scheme qualifier, so the attribute is outside the core model. Send just the category code on the item's classified tax category.

Official rule text

A UBL invoice should not include the ClassifiedTaxCategory/ID schemeID

Common causes

UBL generator qualifies every coded ID with schemeID
Legacy CEN BII / older Peppol templates that used schemeID="UNCL5305"

How do I fix it?

<cac:ClassifiedTaxCategory>
  <cbc:ID>S</cbc:ID>
  <cbc:Percent>22</cbc:Percent>
  <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
</cac:ClassifiedTaxCategory>

Check your invoice against this rule

Paste it into the live demo, or call POST /v1/validate. See the quickstart.