# GR-R-009

Source: https://xmlvalid.com/rules/GR-R-009

> Greek suppliers that send an invoice through the PEPPOL network must use a correct TIN number as an electronic address according to PEPPOL Electronic Address Identifier scheme (schemeID 9933).

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21
- Context: `cac:AccountingSupplierParty/cac:Party[$accountingSupplierCountry='GR' or $accountingSupplierCountry='EL']/cbc:EndpointID`
- Test: `./@schemeID='9933' and u:TinVerification(.)`

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