SAP Message AA191 - Depreciation key & should no longer be changed (Please check)

Diagnosis You changed depreciation key &V1&. The asset has been posted toalready. As a result of changing the depreciation key, the planneddepreciation in open fiscal years will be recalculated. System Response The system automatically starts the depreciation recalculation. Procedure RESET N1 Check the change to the depreciation key again. Confirm you want to make the change by pressing ENTER.