Hi Pavan,
You can change the Dep start date manually and system will recalculate depreciation.
But the system behavior is that it will not recalculate for the closed fiscal years.
So you have to post unplanned depreciation vide T code ABAA.
So the solution for your problem is to change the ord dep start date to start date of current year and post unplanned dep for the balance depreciation.
Hope it solves.
Regards,
GSR