How to retire an asset in Income tax depreciation area?

Dear Sapients

I have done configuration for income tax depreciation as 15 depreciation area. When I am doing acquisition the depreciation amount is coming properly full and half based on the 180 days more and 180 less. But when i am retiring the asset the depreciation amount is wrong. If any body can guide how to retire an asset in 15 depreciation area.

Regards