Hi Bhanu,
The Topic has been discussed multiple times on SCN. Doing a pre search would help in faster Resolution of your issues. Anyways, some of the links on the same Topic are mentioned below. Please check
http://scn.sap.com/thread/3426113
http://scn.sap.com/thread/3228290
http://scn.sap.com/thread/3451492
BR
Amitash