Activity detail diagrams show the tasks to be performed as part of an activity that is associated with a particular role. These diagrams also show mandatory input and output work products for each task. Activity detail diagrams are suitable for activities that consist of only child tasks. You can create activity detail diagrams by using the Diagram editor, and you can include diagrams that are created by other applications.
Activity detail diagrams are generated if you select the Publish activity detail diagrams that have not been created in process editor option when you publish your configuration.
You can modify the activity detail diagram by opening it in the Diagram editor. Use the palette tools to make your modifications, and then save your diagram.
Under Window > Preferences > Method > Publishing/Browsing > Activity Diagrams, select Publish activity detail diagrams that have not been created in process editor so that these diagrams will be generated when you browse your processes.