You can check a JIWA import issue by manually importing the XML files that The Order Exchange creates.
To import a sales order open JIWA and go to Sales, Order Entry on the menu. When the Sales Order screen opens, go to the Utilities tab at the very top, then XML Import. Select the file you want to import (The path is to the files is found in The Order Exchange Accounting System Settings). Any issues with the import will be displayed on the screen.