What it means
When the seller is Greek, the first part of the invoice number (BT-1) must be a nine-digit Greek tax identification number (TIN) that passes the TIN check. It must also match characters 3 to 11 of the seller's VAT number (BT-31), or of the tax representative's VAT number (BT-63). The test reads those VAT numbers from the party tax details where the tax scheme is VAT. It applies to invoices and credit notes.
Why it matters
Peppol BIS Billing 3.0 requires this part of a Greek seller's invoice or credit note number to contain a valid TIN matching the seller's or tax representative's VAT details.
How to fix it
Check the first part of cbc:ID directly under Invoice or CreditNote. Use the valid nine-digit TIN that matches characters 3 to 11 of the seller's VAT number (BT-31) or the tax representative's VAT number (BT-63). Do not include the VAT number's two-character prefix.
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-001-2 still fails, and which other rules do.
Related rules
- GR-R-001-3 Greek invoice number: second part must be the invoice date
- GR-R-001-4 Greek invoice number: third part must be a whole number
- GR-R-001-5 Greek invoice number: fourth part must be a document type
- 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-001-1 A Greek invoice number must have six parts