GR-S-011:Greek suppliers must provide their Seller Tax Registration Number, prefixed...
Fix: Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (GR-S-011). Upload your invoice to fix this automatically.
Greek suppliers must provide their Seller Tax Registration Number with the country code prefix. This is the VAT identification for Greek tax purposes.
Engine Classification
Ensure Greek IAPR classification code is present for line items
Confidence: 75% · Applied automatically in pipeline
What is GR-S-011?
GR-S-011 is a fatal validation rule defined in the CIUS-GR (Greece) specification (GRC national rules). It validates the ItemClassificationCode element under Item > CommodityClassification in the UBL invoice XML.
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Target path: //cac:InvoiceLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode
Why This Error Matters
Invoice may be flagged for missing tax registration. Greek sellers should provide complete tax identification.
GR-S-011 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: GR-S-011
- ·Specification: CIUS-GR (Greece)
How to Fix It
Find the missing or empty field
Check cbc:ItemClassificationCode at //cac:InvoiceLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode. This field is required but is either missing or empty.
Set the required value
Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (GR-S-011).
Re-validate your invoice
Upload the corrected invoice to confirm GR-S-011 is resolved.
Before / After
<Invoice> <!-- Issue: Greek suppliers must provide their Seller Tax Registration N --> </Invoice>
<Invoice> <!-- Issue resolved per CIUS-GR (Greece) --> </Invoice>
Technical Reference
//cac:InvoiceLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCodeCommon Causes
- ·Seller tax registration missing
- ·Country code prefix not included
- ·Tax ID without EL prefix
- ·Field not populated in company settings
- ·Tax registration stored separately from invoice data
Seeing this in production? The API handles GR-S-011 automatically. See the fix response →
Frequently Asked Questions
Greek suppliers must provide their Seller Tax Registration Number with the country code prefix. This is the VAT identification for Greek tax purposes.
Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (GR-S-011). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
Yes, GR-S-011 is a critical error that will cause invoice rejection. It must be fixed before submission.
Many instances of GR-S-011 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.
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Last updated: 14 April 2026
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