Required fields in the Greek B2G e-Invoice (Peppol, Greek CIUS)

A practical guide to completing mandatory electronic invoice fields when working with Greek government customers (B2G). It describes the requirements of EN 16931 and Greek CIUS (Peppol BIS 3.0), the structure of key BT fields (BT-11 Project Reference, BT-12 ADAM, BT-49 Buyer Electronic Address, etc.), as well as the specifics of sending via Peppol and checking the invoice status.