When you transfer an asset between Classifications (like Location) in AssetAccountant, all of the balance sheet items (like Cost and Accumulated Depreciation) need to move to the new Location.
This is so that the asset is transferred at its carrying value at the time of the transfer, which is the sum of the Cost and Accumulated Depreciation.
Profit and Loss items like Depreciation Expense, on the other hand remain with the originating Classification before the transfer date.