GR-R-004:Greek VAT category code required
myDATA requires Greek-specific VAT category codes.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: myDATA VAT Category
What is GR-R-004?
GR-R-004 is a fatal validation rule defined in the ubl-2.1 specification (GRC national rules). It validates the XPath: Extension for Greek VAT category element 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: Extension for Greek VAT category
Why This Error Matters
Greek tax reporting uses specific VAT codes.
GR-R-004 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-004
- ·Specification: ubl-2.1
How to Fix It
Map category
EN16931 to Greek VAT category
Add code
1-8 or exempt codes
XML Example
Generic example based on the rule's target XPath. Your actual XML structure may differ.
<!-- Triggers validation error --> <XPath: Extension for Greek VAT category></XPath: Extension for Greek VAT category>
<!-- Corrected --> <XPath: Extension for Greek VAT category>VALID_VALUE</XPath: Extension for Greek VAT category>
Technical Reference
XPath: Extension for Greek VAT categoryCommon Causes
- ·Missing Greek VAT code
- ·Mapping error
Seeing this in production? The API handles GR-R-004 automatically. See the fix response →
Frequently Asked Questions
myDATA requires Greek-specific VAT category codes.
Map EN16931 VAT category to Greek code. Invoice Navigator can help identify and fix this issue.
Yes, GR-R-004 is a critical error that must be fixed.
Related Errors
Last updated: 27 February 2026
Handle GR-R-004 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.