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There are 8 different workitems (W_-activities) in the Application log. I assume that each of them is associated with some manual work. However, that probably depends on their specific lifecycle transition. There are 7 different lifecycle transisitions of W_-activities (suspend, complete, start, resume, schedule, ate_abort, withdraw). Which of these involve some "real" manual work, and which ones are just system events with no subsequent manual activities?
I could imagine that "suspend", "schedule", etc. fall into the category of pure system events, but I'm not sure. Can you give us a more comprehensive explanation on which lifecycle transitions involve manual work?