GR-R-001:Greek AFM (VAT number) required
Greek invoices must include 9-digit AFM.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: Greek VAT Number (AFM)
What is GR-R-001?
GR-R-001 is a fatal validation rule defined in the ubl-2.1 specification (GRC national rules). It validates the CompanyID element under PartyTaxScheme in the UBL invoice XML.
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.
Target path: XPath: //cac:PartyTaxScheme/cbc:CompanyID
Why This Error Matters
AFM required for Greek tax compliance.
GR-R-001 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
- ·Fails UBL schema validation
- ·Error returned: GR-R-001
- ·Specification: ubl-2.1
How to Fix It
Get AFM
9-digit Greek tax number
Add to invoice
EL prefix + AFM
XML Example
Generic example based on the rule's target XPath. Your actual XML structure may differ.
<!-- Missing or empty element triggers cbc:CompanyID error --> <cbc:CompanyID></cbc:CompanyID>
<!-- Provide the required value --> <cbc:CompanyID>VALID_VALUE</cbc:CompanyID>
Technical Reference
XPath: //cac:PartyTaxScheme/cbc:CompanyIDCommon Causes
- ·Missing AFM
- ·Wrong format
- ·Using GR instead of EL
Seeing this in production? The API handles GR-R-001 automatically. See the fix response →
Frequently Asked Questions
Greek invoices must include 9-digit AFM.
Add EL + 9 digit AFM. Invoice Navigator can help identify and fix this issue.
Yes, GR-R-001 is a critical error that must be fixed.
Related Errors
Last updated: 27 February 2026
Handle GR-R-001 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.