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Warning

UBL-DT-23: Leave out the uri attribute

In short

Warning: worth checking.

UBL-DT-23 means the invoice contains a uri attribute, which the standard asks you to leave out. Remove the attribute wherever it occurs to clear the warning.

On this page

What it means

The check searches the whole file for a lowercase uri attribute. In UBL it can occur on a binary object, such as an embedded attachment (BT-125), to identify a location for the binary data. This rule flags the attribute wherever it occurs. It does not prohibit the separate external document link (BT-124).

Why it matters

EN 16931 asks you to omit uri attributes from UBL invoices and credit notes.

How to fix it

Remove the uri attribute from every element that has it, or ask the supplier of your invoicing software to stop writing it. On embedded attachments, keep the mimeCode and filename attributes, which are required. If you want to point to a document online instead, use the external document link (BT-124) and not this attribute. Export again and 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

Uri attribute should not be present

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-DT-23 still fails, and which other rules do.

Updated 6 November 2026