It is possible that the asset has been completely depreciated. When you add an improvement asset, the amount of years it is depreciated is not the same as the home.
When an asset has been completely depreciated, there will be no depreciation deduction in the year you are filing and therefore the program will not show a prior year depreciation amount. Any Section 179 deduction you took will not show prior year depreciation since it has already been completely depreciated.
