Hi Santosh,
Understood the fact that there are no actuals for that Team member. Also you have checked that there is no timesheet for the resource which is in posted or submitted status.
Have you checked if the resource is involved in any Requisitions. You can see that from Team --> Requisitions page. (You might have checked it already but as you have not mentioned the same hence, suggesting)
Again, is there any timesheet where the affected resource has added any of the Tasks as a Line Item? Timesheet might be in Open status but there could be a line item with non-zero time reported. You can check that by combining PRTASK and PRTIMEENTRY tables, I guess. Try that if possible.
Thanks,
Abhisek Dhar