# GR-R-001-2

Source: https://xmlvalid.com/rules/GR-R-001-2

> When the Supplier is Greek, the Invoice Id first segment must be a valid TIN Number and match either the Supplier's or the Tax Representative's Tin Number

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21
- Context: `/ubl-invoice:Invoice/cbc:ID[$isGreekSender] | /ubl-creditnote:CreditNote/cbc:ID[$isGreekSender]`
- Test: `string-length(normalize-space($IdSegments[1])) = 9 and u:TinVerification($IdSegments[1]) and ($IdSegments[1] = /*/cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme[cac:TaxScheme/cbc:ID = 'VAT']/substring(cbc:CompanyID, 3, 9) or $IdSegments[1] = /*/cac:TaxRepresentativeParty/cac:PartyTaxScheme[cac:TaxScheme/cbc:ID = 'VAT']/substring(cbc:CompanyID, 3, 9) )`

Validate a document against these rules: https://xmlvalid.com/validate