Last year assets treatment

Yes you can show it in balance sheet
in current balance sheet you bring the asset value by deducting the previous depreciation
means if asset is 1000 in privious
depreciation is 100 in previous
then current year asset value is 1000 minus 100
then again in current year you deprecated it as per rule

Yes have to deduct deprecation last year then this year on wdv

There is one accounting standard called PRIOR PERIOD ADJUSTMENT .

ACCOUNTING STANDARD 5 PROVIDES PROSPECTIVE CORRECTION OF PRIOR PERIOD ERROR AND OMISSIONS IN THE CURRENT YEARS PROFIT AND LOSS ACCOUNT AND REQUIRES DISCLOSURE OF NATURE AND AMOUNT OF PRIOR PERIOD ITEM ITEM IN SUCH MANNER.
THE IMPACT OF PROFIT LOSS CAN BE PERCEIVED.
PREVIOUSLY IT WAS ACCOUNTING STANDARD 5 NOW IT HAS BEEN CHANGED ACCORDINGLY.