Internal orders are used to plan, collect and settle the costs of internal activities of the entity. The SAP system enables monitoring of internal orders with standard reports. They are created to control costs of internal activities.
In SD module there is an incompletion log. Incompletion log is a functionality, which allow the user to check what kind of data are required, but missing in the sales document. Incompletion log allows to get into the proper field that should be filled in the document.