# GR-R-001-3

> When the Supplier is Greek, the Invoice Id second segment must be a valid Date that matches the invoice Issue Date

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/gr-r-001-3

## Official rule text

When the Supplier is Greek, the Invoice Id second segment must be a valid Date that matches the invoice Issue Date