Hi Pankaj,
It is not possible to give asset value date in previous year.
What you can do is to create asset with capitalisation date 20.03.2013 and Ordinary dep start date and asset value date as 01.04.2013 then post acquisitions.
Depreciation will be calculated for current year and you can post unplanned depreciation for last year's depreciation amount vide T code ABAA.
Hope it solves.
Regards,
G.Sethuraman