What it means
When the seller is Greek, the fourth part of the invoice number (BT-1) must be filled in and must be exactly one of the document type codes in the Greek list. The test compares the part with each code in the list, so extra characters cause a mismatch. It applies to invoices and credit notes.
Why it matters
Peppol BIS Billing 3.0 requires the fourth part of a Greek seller's invoice or credit note number to contain a permitted Greek document type code.
How to fix it
Replace the fourth part of cbc:ID directly under Invoice or CreditNote with the appropriate code from the permitted Greek document type list. Copy the code exactly, without adding spaces. If you are unsure which code fits your document, ask your accountant.
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-001-5 still fails, and which other rules do.
Related rules
- GR-R-001-6 Greek invoice number: fifth part must not be empty
- GR-R-001-7 Greek invoice number: sixth part must not be empty
- GR-R-001-4 Greek invoice number: third part must be a whole number
- GR-R-001-3 Greek invoice number: second part must be the invoice date
- GR-R-001-2 Greek invoice number: first part must be a valid TIN
- GR-R-001-1 A Greek invoice number must have six parts