What it means
When the seller is Greek and the seller's address country code (BT-40) is GR, the UBL invoice or credit note may contain zero or one cac:AdditionalDocumentReference whose cbc:DocumentDescription equals ##INVOICE|URL##. Two or more fail this check. The test counts references, not distinct web addresses.
Why it matters
The rule limits the document to one designated invoice link reference, even if repeated references contain the same address. It does not establish recipient confusion or rejection.
How to fix it
Find all references labelled ##INVOICE|URL## and keep only the one you intend to use for the invoice web address. Leave unrelated references in place. You can omit this reference for GR-R-008-2, but GR-S-008-1 warns when there is not exactly one. Check the corrected file again.
Once the file is corrected, check it again for free: Validate a Peppol BIS invoice
Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice
The rule as published
Read the rule on the publisher's site
Where this rule applies
| Rule set | Version |
|---|---|
| Peppol BIS Billing 3.0 (invoice) | 2026.5 |
| Peppol BIS Billing 3.0 (credit note) | 2026.5 |
Check your file
Drop your e-invoice to see whether GR-R-008-2 still fails, and which other rules do.