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Warning

UBL-CR-107: Leave the validity period out of the contract reference

In short

Warning: worth checking.

UBL-CR-107 means the contract reference in your UBL invoice or credit note carries a validity period (cac:ValidityPeriod), which EN 16931 does not use. Delete that element from cac:ContractDocumentReference and check the file again.

On this page

What it means

A UBL invoice or credit note points to a contract with cac:ContractDocumentReference. EN 16931 only uses the contract number from it (BT-12, in cbc:ID). This rule checks that the block does not also contain a validity period (cac:ValidityPeriod), the start and end dates of the contract.

Why it matters

EN 16931 recommends leaving the validity period out of the contract reference.

How to fix it

Remove the contract validity period from the contract reference in your invoicing software, or ask its supplier to stop exporting it. If you meant the period the invoice covers, use the invoicing period (BG-14) instead. If you build the XML yourself, delete cac:ValidityPeriod from cac:ContractDocumentReference. Recheck the corrected file.

Once the file is corrected, check it again for free: Validate an invoice against EN 16931

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice

The rule as published

A UBL invoice should not include the ContractDocumentReference ValidityPeriod

Where this rule applies

Rule set Version
EN 16931 (UBL) 1.3.17
EN 16931 (UBL credit note) 1.3.17
XRechnung 3.0 (UBL) 3.0.2
XRechnung 3.0 (UBL credit note) 3.0.2
Peppol BIS Billing 3.0 (invoice) 2026.5
Peppol BIS Billing 3.0 (credit note) 2026.5
SI-UBL 2.0 / NLCIUS (invoice) 2.0.3.13
SI-UBL 2.0 / NLCIUS (credit note) 2.0.3.13
France CTC (UBL invoice) 1.4.0-04
France CTC (UBL credit note) 1.4.0-04
CIUS-RO UBL Invoice 1.0.9 1.0.9
CIUS-RO UBL Credit Note 1.0.9 1.0.9
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether UBL-CR-107 still fails, and which other rules do.

Updated 6 November 2026