What it means
For a Greek seller, each cac:AdditionalDocumentReference whose cbc:DocumentDescription equals ##INVOICE|URL## must contain cac:Attachment/cac:ExternalReference/cbc:URI with a value that remains non-empty after XPath whitespace normalisation. Spaces, tabs or line breaks alone do not satisfy the check. It does not check the address format or whether the link works.
Why it matters
The labelled reference is intended to provide an invoice link. Without an address, it gives the recipient nothing to open. This check does not establish whether the recipient will reject the document.
How to fix it
Enter the invoice web address in cac:Attachment/cac:ExternalReference/cbc:URI inside the reference labelled ##INVOICE|URL##. If you do not provide a link, remove that whole reference rather than leaving its URI empty. Removing it may trigger the separate warning GR-S-008-1. 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-008-3 still fails, and which other rules do.