How do I fix GR-S-011?

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.

Is GR-S-011 a critical error?

Yes, GR-S-011 is a critical error that will cause invoice rejection. It must be fixed before submission.

Can GR-S-011 be automatically fixed?

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.

errorGRCCIUS-GR (Greece)

`GR-S-011`:Greek suppliers must provide their Seller Tax Registration Number, prefixed...

Greek suppliers must provide their Seller Tax Registration Number with the country code prefix. This is the VAT identification for Greek tax purposes.

Severity

Fatal

Rule set

CIUS-GR (Greece)

Country

GRC

Fix type

AUTO-FIX

Confidence

75%

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 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: //cac:InvoiceLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode

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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. 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.

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)

Before / After

Failing XML

<Invoice>
  <!-- Issue: Greek suppliers must provide their Seller Tax Registration N -->
</Invoice>

Corrected XML

<Invoice>
  <!-- Issue resolved per CIUS-GR (Greece) -->
</Invoice>

Technical Reference

XPath//cac:InvoiceLine/cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode

SpecCIUS-GR (Greece)

Operationset_default

StrategyEnsure Greek IAPR classification code is present for line items

Common 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 →

Related Errors

GR-R-003

Greek invoice type code required

GR-R-009

Greek suppliers must use their correct TIN as the electronic address for...

GR-R-010

When Greek suppliers send invoices to Greek buyers via PEPPOL, the buyer...

Last updated: 27 February 2026

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Handle GR-S-011 Automatically in Your Pipeline

The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.

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GR-S-011:Greek suppliers must provide their Seller Tax Registration Number, prefixed...