How can I debug the function that call with 'in update task'

Question: Now I can't debug the function module that call with update task. Is it possible to debug this? If it can, could you please tell me how to debug it?

Answer:
In the debugger, go to the menubar Settings->Update debug. on/off (for 31I) or Settings->Update debugging (for 46C). When the update task is triggered, it will appear in another debug window.

(quoted from: http://expertanswercenter.techtarget.com/eac/knowledgebaseAnswer/0,295199,sid63_gci982790,00.html)
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