Investment key & uses the same depreciation area (Please correct)

What causes this issue?

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

System Response

The system cannot accept this new key.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.