Hi Modak,
First of all many many thanks for your quick reply.
Now, I got clear about the Workflow. I am explaining the issue.
When ever a capitalization form is Submitted my workflow triggers and approvals are send to several users according to Rule. Any one of them approves it from portal then my workflow ends sending a notification and WBS elements are updated in Custom Table. Here all like BO, Event, Workflow, Form screen(Webdynpro) are Custom.
Now the problem is USER has seen(but not Executed) the work item several times. It's status is Ready,
But my data has been updated in Table which should not be.