Counterfoil rule note
Quoted from a public specification. This page is not a validator, and it is not tax, legal, or accounting advice.
Project reference shall occur maximum once.
Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-39/
Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL
Severity note: fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.
The project reference shall occur at most once. The statement ends with a period and says shall. It is 43 characters. The flag is fatal. The context is the same string as BR-CO-18. The published test counts cac:ProjectReference/cbc:ID. The count comparison has a space before <= and a space after it.
Send at most one project reference identifier.
Illustration of the condition in the official statement. Not an example published by the source.
Fails the stated condition. The invoice has two project reference identifiers.
Passes the stated condition. The invoice has one project reference identifier, or none.
Copied from the source. Not reimplemented on this page.
/ubl:Invoice | /cn:CreditNote
(count(cac:ProjectReference/cbc:ID) <= 1)
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