To attach a document in XML electronic invoices just follow these steps : In this example we'll create an Project e-invoice First be sure the customer has these 2 flags enabled in the E-INVOICE section :- eInvoiceregister- einvoice attachment Now create a ProjectCreate an item requirement orderPost the Packing slipReturn to the project and create … Continue reading AX / D365FO – Attach documents (in base64 format) in Electronic Invoice XML files