You cannot post to this asset (Depreciation key & does not exist)

What causes this issue?

Depreciation key &V1& has been entered in area &V2&. However, this
depreciation key has not been defined.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Using master data help, enter a different, appropriate key.

Error message extract from SAP system. Copyright SAP SE.