Hi Modak,
The follwoing link explains a pattern with solution what exaclty i want.
User Status Management for Element Workflows - SAP Document Builder - SCN Wiki
but i could not found WS40500038 (the above mentioned item) in our Workflow Template Repository.
the thing is here, they have mentioned its 'user status' but i need 'document status'. i would be so happy if you can help me finding a standard workflow for Document staus change or suggest ways to find it.
thanks in advance