What it means
The rule warns if cac:AccountingCustomerParty/cac:Party in a UBL invoice or credit note contains cbc:WebsiteURI. That element is the web address of the buyer. EN 16931 describes the buyer by name, address, identifiers, contact and electronic address, and does not include a dedicated website field.
Why it matters
This rule excludes the buyer's website field from the UBL party details. It checks for the element's presence, not whether the website address is valid.
How to fix it
Remove cbc:WebsiteURI from cac:AccountingCustomerParty/cac:Party. If your invoicing software adds it, ask its supplier to leave it out of the e-invoice export. 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
A UBL invoice should not include the AccountingCustomerParty Party WebsiteURI 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-206 still fails, and which other rules do.
Related rules
- UBL-CR-207 The buyer should not have a logo reference
- UBL-CR-208 The buyer should not have an industry classification code
- UBL-CR-209 The buyer should not have a language element
- UBL-CR-210 The buyer's address should not have an address ID
- UBL-CR-211 The buyer's address should not have an address type code
- UBL-CR-212 The buyer's address should not have an address format code