Hi Konstantin,
Thank you for the suggestions.
I was using different methods of the class /SAPSRM/CL_WF_PROCESS_MANAGER, But did not really helped me to resolve the issue. The workitems are not approve/complete/reject.
It would be great if you could suggest any other methods available.
I was trying to debug the webdynpro application and unable point out exact place.
Thank you
Magesh