# IS-R-009

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

> If seller is icelandic and invoice contains supporting description EINDAGI invoice must have due date — Ef seljandi er íslenskur þá skal reikningur sem inniheldur eindaga (BT-122, DocumentDescription = EINDAGI) einnig hafa gjalddaga (BT-9).

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21
- Context: `ubl-creditnote:CreditNote[$SupplierCountry = 'IS'] | ubl-invoice:Invoice[$SupplierCountry = 'IS']`
- Test: `(exists(cac:AdditionalDocumentReference[cbc:DocumentDescription = 'EINDAGI']) and exists(cbc:DueDate)) or not(exists(cac:AdditionalDocumentReference[cbc:DocumentDescription = 'EINDAGI']))`

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