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Warning

UBL-CR-528: An order line reference should not hold a whole order reference

In short

Warning: worth checking.

UBL-CR-528 means the order reference on an invoice or credit note line contains a nested cac:OrderReference, which EN 16931 does not use there. It is a warning; remove the nested order reference and recheck the file. This rule does not require you to add a document-level purchase order number.

On this page

What it means

The rule warns if cac:OrderReference is present inside cac:OrderLineReference on any invoice or credit note line, even if the nested element is empty. It does not check the purchase order line reference (BT-132) in cbc:LineID or the document-level purchase order number (BT-13).

Why it matters

EN 16931 does not use cac:OrderReference inside a line's cac:OrderLineReference.

How to fix it

Delete cac:OrderReference from cac:OrderLineReference inside cac:InvoiceLine (cac:CreditNoteLine in a credit note), keeping any purchase order line reference (BT-132) in cbc:LineID. If you need to give a purchase order number, use the document-level purchase order number (BT-13). If one invoice covers several orders, you can mention them in the line notes (BT-127). 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 OrderLineReference OrderReference

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-528 still fails, and which other rules do.

Updated 6 November 2026