Peppol BIS Billing 3.0 · rule
GR-R-004-1
What does GR-R-004-1 mean? When Supplier is Greek, there must be one MARK Number
Why did my invoice fail GR-R-004-1?
When the supplier is Greek, the invoice must contain exactly one MARK number. The MARK (Unique Registration Number) is the identifier assigned by the Greek tax authority's myDATA platform when the invoice is reported, and Greek invoices must carry it so receivers can verify the invoice was registered. In the Peppol mapping it is conveyed as a document-level reference (an additional document reference identifying the MARK), and there must be one and only one.
Official rule text
When Supplier is Greek, there must be one MARK Number
Common causes
- Invoice sent before myDATA reporting, so no MARK exists yet
- The MARK reference element omitted or not labelled so the validator can recognise it
- Two MARK references present after a resubmission
Related rules
Check your invoice against this rule
Paste it into the live demo, or call POST /v1/validate. See the quickstart.