What causes this issue?

An investment key &V2& has been proposed from the reference. The
depreciation area &V1& for this investment key is not active in the
asset class.

System Response

The system cannot create the investment key &V2&, and therefore, does
not include the investment key in the new asset.

How to fix this error?

You cannot post investment support &V2& for the asset class. If you
need investment support &V2&, activate depreciation area &V1& in the
asset class using transaction AM02. After this you can create the asset
with investment support &V2&.

Error message extract from SAP system. Copyright SAP SE.