# GR-R-001-5

> When Supplier is Greek, the Invoice Id in the fourth segment must be a valid greek document type

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/gr-r-001-5

## Official rule text

When Supplier is Greek, the Invoice Id in the fourth segment must be a valid greek document type