For the submission of an electronic invoice to a Greek Contracting Authority, you need to follow the rules of the Greek format (Peppol BIS Billing 3.0 – Greek CIUS specification). The Greek specification defines mandatory fields that are necessary for the correct routing to the Contracting Authority’s system. The correct field values are provided exclusively by the Contracting Authority that will receive the electronic invoice. Enter the values of the required fields and obtain the corresponding XML segments that must be incorporated into your invoice, in accordance with the Greek specification.