Hi Nitin,
How do you assign the role to the user? if it's trought IDM UI, you loggin with which user?
There is a limitation on approval with SP08 : the requestor of the assignement can not be define as an approver.... but in this case the approval is automaticaly rejected by the system ...
in which logs / table can you see that your request is "pending for approval" ?
I also would recomand you to use the simple scenario "get approver from role/privs" of as krishna mentioned. (unless you need to do more custum actions)
Besides, you can check approval entries and status in DB views :MXWV_ApprovalQueue ...
Fadoua
