GR-R-004-1:When Supplier is Greek, there must be one MARK Number
Greek supplier invoices must include one MARK (Μοναδικός Αριθμός Καταχώρησης) number. This is the unique registration number from the Greek myDATA system.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: MARK Number (myDATA)
What is GR-R-004-1?
GR-R-004-1 is a fatal validation rule defined in the PEPPOL_BIS specification (GRC national rules). It checks whether when supplier is greek, there must be one mark number.
When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.
Why This Error Matters
Invoice will be rejected by Greek validation. MARK number is mandatory for Greek e-invoicing compliance.
GR-R-004-1 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.
Validator Behavior
- ·Causes invoice rejection
- ·Rejected by PEPPOL Access Points
- ·Error returned: GR-R-004-1
- ·Specification: PEPPOL_BIS
Technical Reference
Common Causes
- ·MARK number not included in invoice
- ·Invoice not yet registered with myDATA
- ·ERP does not capture MARK numbers
- ·MARK field not mapped in export
- ·Manual invoice without myDATA registration
Seeing this in production? The API handles GR-R-004-1 automatically. See the fix response →
Last updated: 27 February 2026
Handle GR-R-004-1 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.