What it means
This rule checks that the item information on a line (BG-31) has no certificate (cac:Certificate), meaning data about a quality, safety or compliance certificate for the item, such as its type, number and issuer. It looks at every line of the invoice or credit note.
Why it matters
The EN 16931 UBL rules exclude certificate blocks from a line's structured item information.
How to fix it
If the buyer needs the certificate, add the document as an attachment to the invoice (BG-24) or write its number in the item description (BT-154). Then delete cac:Certificate from cac:Item on every affected cac:InvoiceLine or cac:CreditNoteLine. Export the corrected file and recheck it.
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 Item Certificate 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-623 still fails, and which other rules do.
Related rules
- UBL-CR-624 Item dimensions do not belong on an invoice line
- UBL-CR-625 A price change reason does not belong on the line price
- UBL-CR-626 A price type code does not belong on the line price
- UBL-CR-627 Price type text does not belong on the line price
- UBL-CR-628 An orderable unit factor does not belong on the line price
- UBL-CR-629 Check the price validity period element