Changing depreciation key of existing assets

Hello all,

I have a question regarding changing depreciation key of existing assets. We have depreciation area 10 set up for tax depreciation which includes special depreciation. A custom depreciation key was created to meet this requirement (Z200 - declining balance with special depreciation).

The tax department would like to change the asset by reverting back to the normal depreciation calculation (M200 - declining balance, no special depreciation). However, when I changed the depreciation key back to M200, the special depreciation amount still shows up in asset explorer and reports. I tried to re-calculate asset value and the special depreciation amount remains in the asset.

Any idea how to remove the special depreciation?

Thanks,

Cassandra