What it means
When the seller is Greek, the second part of the invoice number (BT-1) must be a valid date written in the order day, month, year (dd/mm/yyyy). Its day, month and year must each match the invoice date (BT-2), which the file stores in the order year, month, day. The test splits both dates and compares them part by part. It applies to invoices and credit notes.
Why it matters
The date in the number is a copy of the invoice date.
How to fix it
Compare the date in the second part of the invoice number with the invoice date, and correct whichever is wrong. Write the date in the number as dd/mm/yyyy.
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-001-3 still fails, and which other rules do.
Related rules
- 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-001-2 Greek invoice number: first part must be a valid TIN
- GR-R-001-1 A Greek invoice number must have six parts