Trying to start depreciation - depr. key 0000 to LINA?

Hello:

I have an asset that needs to be depreciated. It was capitalized on 9/30/2011 and additions/acquisitions have been booked to it since. When I go to the Deprec. Areas Tab the depreciation key is "0000" all the way down. No depreciation expense has ever been booked for this asset.

Depreciation is suppossed to start upon the completion of the project, the completion date is 11/1/2012. I tried to just change the depreciation key from 0000 to LINA using transaction code AS02 and specify the change the Dep Start date to 11/1/2012. This gives me a "Depreciation Key 0000 should no longer be changed", I cannot ignore or save my changes..

I am still new to SAP F/A, please let me know if there is a problem with this approach. Is there a better way to initiate the depreciation for this asset?

Thanks in advance

JP