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PEPPOL-EN16931-R080 - Only one project reference at document level

A document may be attached to a single project (BT-11). Several project references would leave the recipient unable to decide which project to charge.

PEPPOL-EN16931-R080 - Only one project reference at document level

A document may be attached to a single project (BT-11). Several project references would leave the recipient unable to decide which project to charge. This is a Peppol BIS Billing 3.0 rule. It applies on top of the EN 16931 core standard, on invoices exchanged over the Peppol network.

ReferencesPeppol BIS 3.0BT-11 Error
This is a Peppol BIS Billing 3.0 rule. It applies on top of the EN 16931 core standard, on invoices exchanged over the Peppol network.

What this rule checks

A document may be attached to a single project (BT-11). Several project references would leave the recipient unable to decide which project to charge.

How to fix it

Keep one cac:ProjectReference/cbc:ID at document level and remove the others.

Validate against this rule

This rule is part of EN 16931. Check your invoice with the validator that matches your format:

UBL / PeppolXRechnungFactur-X / ZUGFeRD

Related rules

BR-52Each supporting document needs a referenceBR-55Each preceding invoice reference needs a numberPEPPOL-EN16931-R003A buyer reference or a purchase order reference is requiredPEPPOL-EN16931-R100Only one invoiced object identifier per linePEPPOL-EN16931-R101Line document reference must be the invoiced objectBR-DE-21Specification identifier should be the XRechnung one

Source: OpenPeppol BIS Billing 3.0 · Last verified: 2026-07-10

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