Counterfoil rule note
Quoted from a public specification. This page is not a validator, and it is not tax, legal, or accounting advice.
Preceding invoice reference shall occur maximum once
Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-06/
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.
A preceding invoice reference shall occur at most once. The statement has no period and says shall. The flag is fatal. The context is cac:BillingReference, not the invoice root. The published test is (count(cac:InvoiceDocumentReference) <= 1). The comparison has a space before <= and a space after it.
Send at most one invoice document reference inside a billing reference.
Illustration of the condition in the official statement. Not an example published by the source.
Fails the stated condition. A billing reference contains two invoice document references.
Passes the stated condition. A billing reference contains one invoice document reference, or none.
Copied from the source. Not reimplemented on this page.
cac:BillingReference
(count(cac:InvoiceDocumentReference) <= 1)
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