Hi Ramesh,
Ask your basis team to apply Addon IW_PGW
If the addon is already present, then goto transaction /n/iwfnd/maint_service - Add Service - Choose System Alias - Get Services and select TASKPROCESSING with version 2 and add it to your local object. Once the service is in, then add the system alias to it and make sure that Odata is active.
Hope this helps,
thanks,
JC