# GR-R-008-3

> When Supplier is Greek and the INVOICE URL Document reference exists, the External Reference URI should be present

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/gr-r-008-3

## Official rule text

When Supplier is Greek and the INVOICE URL Document reference exists, the External Reference URI should be present