GR-R-001-2:The first segment of Greek invoice ID must be a valid TIN matching the...
Fix: The first segment of Greek invoice ID must be a valid TIN matching the supplier or tax representative. This links the invoice to the correct Greek tax entity. Upload your invoice to fix this automatically.
The first segment of Greek invoice ID must be a valid TIN matching the supplier or tax representative. This links the invoice to the correct Greek tax entity.
Engine Classification
Normalize Greek VAT identifier to EL prefix format
Confidence: 85% · Applied automatically in pipeline
What is GR-R-001-2?
GR-R-001-2 is a fatal validation rule defined in the CIUS-GR (Greece) specification (GRC national rules). It validates the CompanyID element under PartyTaxScheme[cac:TaxScheme > ID='VAT'] 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:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme[cac:TaxScheme/cbc:ID='VAT']/cbc:CompanyID
Why This Error Matters
Invoice will be rejected by Greek validation. Invoice ID TIN must match registered entity for tax compliance.
GR-R-001-2 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-R-001-2
- ·Specification: CIUS-GR (Greece)
How to Fix It
Find the incorrectly formatted value
Check cbc:CompanyID at //cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme[cac:TaxScheme/cbc:ID='VAT']/cbc:CompanyID. The current value does not match the required format.
Apply the correct format
The first segment of Greek invoice ID must be a valid TIN matching the supplier or tax representative. This links the invoice to the correct Greek tax entity.
Update your export settings
If this occurs consistently, check your invoicing software's locale and format settings for XML export. Re-validate to confirm GR-R-001-2 is resolved.
Before / After
<Invoice> <!-- Issue: When the Supplier is Greek, the Invoice Id first segment mus --> </Invoice>
<Invoice> <!-- Issue resolved per CIUS-GR (Greece) --> </Invoice>
Technical Reference
//cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme[cac:TaxScheme/cbc:ID='VAT']/cbc:CompanyIDCommon Causes
- ·First segment is not a valid TIN
- ·TIN does not match supplier or tax rep
- ·Wrong TIN used in invoice ID
- ·TIN format incorrect
- ·Invoice ID manually created with wrong TIN
Seeing this in production? The API handles GR-R-001-2 automatically. See the fix response →
Frequently Asked Questions
The first segment of Greek invoice ID must be a valid TIN matching the supplier or tax representative. This links the invoice to the correct Greek tax entity.
The first segment of Greek invoice ID must be a valid TIN matching the supplier or tax representative. This links the invoice to the correct Greek tax entity. You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
Yes, GR-R-001-2 is a critical error that will cause invoice rejection. It must be fixed before submission.
Many instances of GR-R-001-2 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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