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Warning

UBL-CR-522: A line period should not have a duration

In short

Warning: worth checking.

UBL-CR-522 means the period on an invoice or credit note line has a duration (cbc:DurationMeasure), which EN 16931 does not use. It is a warning; remove the duration from the line period and recheck the file. This rule does not require both a start date and an end date.

On this page

What it means

The rule checks the period on every line (cac:InvoicePeriod inside cac:InvoiceLine, or cac:CreditNoteLine in a credit note) for a cbc:DurationMeasure, the length of the period as a number and a unit, such as 3 months. It concerns the line period (BG-26), but does not require both a start date (BT-134) and an end date (BT-135).

Why it matters

EN 16931 does not use a duration in a line period.

How to fix it

Delete cbc:DurationMeasure from cac:InvoicePeriod inside each affected cac:InvoiceLine or cac:CreditNoteLine. If you need to state the period, use the applicable start date (BT-134), end date (BT-135), or both, rather than a duration. Recheck the 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 InvoiceLine InvoicePeriod DurationMeasure

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-522 still fails, and which other rules do.

Updated 6 November 2026