WSS 3 workflow

I created a three-state-workflow in the custom list.
Staff apply request --> Administrator approve it

However, the user can modify or delete his own record even administrator marked the task In progress or Completed.
Any idea how to prevent staff modify and delete their record after apply the request?
Thank you.
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You would need a custom event handler to accomplish this only after the task is in progress.  If the users could only add items and not edit or delete them, then you could set the list settings >> Advanced Settings >> Create and Edit access.

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George K.Commented:
Yoy can also set your own lever rights in

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