What it means
The rule warns if cac:DocumentReference inside cac:InvoiceLine or cac:CreditNoteLine contains cbc:UUID. It does not check the invoiced object identifier (BT-128) in cbc:ID or the document type code 130 in cbc:DocumentTypeCode.
Why it matters
A UUID in a line document reference does not map to a field in EN 16931. It is worth fixing when you want a clean file, or when the buyer expects to find the reference under the normal identifier.
How to fix it
Open the line in your invoicing software and check its object or document reference fields. Keep the object identifier and clear only the UUID. In the XML, delete cbc:UUID from cac:DocumentReference inside cac:InvoiceLine (cac:CreditNoteLine in a credit note), and keep cbc:ID. 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 DocumentReference 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-533 still fails, and which other rules do.
Related rules
- UBL-CR-534 A line document reference should not carry an issue date
- UBL-CR-535 A line document reference should not carry an issue time
- UBL-CR-537 A line document reference should not carry a text document type
- UBL-CR-538 A line document reference should not carry an XPath
- UBL-CR-539 A line document reference should not carry a language
- UBL-CR-540 A line document reference should not carry a locale code