What it means
The rule warns when cac:OrderLineReference inside any cac:InvoiceLine or cac:CreditNoteLine contains cbc:UUID. It does not check the purchase order line reference (BT-132) in cbc:LineID.
Why it matters
A UUID on an order line reference does not map to any field in the standard. It is worth fixing when you want a file without warnings.
How to fix it
Remove only the UUID from each affected order line reference, keeping any purchase order line reference (BT-132) in cbc:LineID. In the XML, delete cbc:UUID from cac:OrderLineReference inside cac:InvoiceLine (cac:CreditNoteLine in a credit note). 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 UUID 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 |
Check your file
Drop your e-invoice to see whether UBL-CR-526 still fails, and which other rules do.
Related rules
- UBL-CR-527 An order line reference should not carry a status code
- UBL-CR-528 An order line reference should not hold a whole order reference
- UBL-CR-529 A line should not point to a despatch advice line
- UBL-CR-530 A line should not point to a receiving advice line
- UBL-CR-531 A line should not carry its own billing reference
- UBL-CR-532 A line document reference should not carry a copy flag