Post sales invoice
Business Integration Solutions task

When an invoice is created and posted for a sales order, it is added to the Invoice journal. If an applicable document flow with direction 'Outbound' and type 'Invoice' exists, also a record is added to the Outbound message queue. When this record is processed, the 'Sales - Invoice to XML' message is run. As a result, an EDI invoice message file is created and sent to your customer.

For more information on sales order invoice posting, refer to Create sales order invoices.