Counterfoil rule note

UBL-SR-01

Quoted from a public specification. This page is not a validator, and it is not tax, legal, or accounting advice.

Country

EU

Syntax

UBL

Severity

fatal

Last verified

2026-10-18

Official statement

Contract identifier shall occur maximum once.

Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-01/

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.

Plain-language reading

The contract identifier shall occur at most once. The statement ends with a period and says shall. The flag is fatal. The context is the same string as BR-CO-18. The published test is (count(cac:ContractDocumentReference/cbc:ID) <= 1). The comparison has a space before <= and a space after it.

What to change

Send at most one contract document reference identifier.

Illustration

Illustration of the condition in the official statement. Not an example published by the source.

Fails the stated condition. The invoice has two contract document reference identifiers.

Passes the stated condition. The invoice has one contract document reference identifier, or none.

Published context and test

Copied from the source. Not reimplemented on this page.

/ubl:Invoice | /cn:CreditNote

(count(cac:ContractDocumentReference/cbc:ID) <= 1)

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