SAP Message AA260 - Investment key & uses the same depreciation area (Please correct)

Diagnosis
You have defined investment support key &V1&. The depreciation area youhave created for it, is already being used for another investmentsupport key.

System Response
The system cannot accept this new key.

Procedure
Correct the allocation of depreciation areas to the investment supportkey &V1&.
Reverse investment key &V1&.