Depreciation key change

HI,

We are having requirement where if we change the depreciation key, we want system to  post the difference of depreciation which will be effective from date of acquisition.

Suppose we purchased asset in FY 2010 at Rs. 1000 currently depreciating at 10%.

FY     Acquisition value     Dep. Percentage     Depreciation

2010     1000                        10%                    100

2011     1000                         10%                    100

2012     1000                         10%                     100

Now in 2013 we changed the depreciation key to 5%.

2013     1000                         5%                         50+(-50-50-50)=   -100.

2014     1000                         5%                         50

2015     1000                         5%                         50.

Currently I'm getting depreciation which is reversed for current year only.

Regards,

Devesh Chaudhari.