SAP Message AA139 - Delete flag not possible for asset class & chart of dep. &

Diagnosis
Chart of depreciation &V1& in asset class &V2& cannot be deleted.

System Response
The system has determined that asset &V4& exists in company code &V3&.
Therefore, you cannot mark the chart of depreciation for deletion.

Procedure
You will have to reorganize the assets, before you can mark the chartof depreciation for deletion.