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UnassignActivity is the API that is called when an activity is dropped onto the bottom applet in the Dispatch Board view.
The FS DB Unplanned Activity List Ax Applet calls this method (as set in the Drag Drop Business Service applet user property) when an object is dragged off the FS DB Planned GanttChart AX Applet. The method then sets the Activity Status to Unscheduled.
If pre- or post-processing needs to be done on the drag and drop business event to support a specific business process, this method's arguments can be accessed from custom code.