Before you can send a BizTalk sales invoice, you must make sure that you are connected to BizTalk Server. Furthermore, your BizTalk partner must be registered as a BizTalk partner in Microsoft Dynamics NAV and connected to BizTalk Server. Finally, you and your BizTalk partner must have a valid agreement to exchange BizTalk sales invoices.
Once the connection is established, in order to send a BizTalk sales invoice, you must create or open a Microsoft Dynamics NAV posted sales invoice.
To send a BizTalk sales invoice, follow this procedure:
Create or open the Microsoft Dynamics NAV posted sales invoice that you want to send as a BizTalk sales invoice.
Click Functions, Send BizTalk Sales Invoice.
Setting Up Your Own Organization on BizTalk Server from within Microsoft Dynamics NAV
Setting Up a BizTalk Partner in Microsoft Dynamics NAV and Creating the BizTalk Partner on BizTalk Server