GR-R-004-1:When Supplier is Greek, there must be one MARK Number
Fix: Greek supplier invoices must include one MARK (Μοναδικός Αριθμός Καταχώρησης) number. This is the unique registration number from the Greek myDATA system. Provide the required value in the free validator.
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).
When this rule fires, the invoice is rejected by Peppol access points and never reaches 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 — the invoice must be corrected and re-sent before it can reach the recipient.
Validator Behavior
- ·Causes invoice rejection
- ·Rejected by PEPPOL Access Points
- ·Error returned: GR-R-004-1
- ·Specification: PEPPOL_BIS
How to Fix It
Identify the missing data
Greek supplier invoices must include one MARK (Μοναδικός Αριθμός Καταχώρησης) number. This is the unique registration number from the Greek myDATA system.
Provide the required value
Greek supplier invoices must include one MARK (Μοναδικός Αριθμός Καταχώρησης) number. This is the unique registration number from the Greek myDATA system.
Re-validate your invoice
Upload the corrected invoice to confirm GR-R-004-1 is resolved.
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 →
Frequently Asked Questions
Greek supplier invoices must include one MARK (Μοναδικός Αριθμός Καταχώρησης) number. This is the unique registration number from the Greek myDATA system.
Greek supplier invoices must include one MARK (Μοναδικός Αριθμός Καταχώρησης) number. This is the unique registration number from the Greek myDATA system. You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
Yes, GR-R-004-1 is a critical error that will cause invoice rejection. It must be fixed before submission.
Many instances of GR-R-004-1 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.
Related Content
Last updated: 14 April 2026
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