Specify a base depreciation area

What causes this issue?

You have not entered a base depreciation area. The values of the base
depreciation area are the basis for determining the maximum amount
limit for investment support. You are required to enter a base
depreciation area (e.g. book depreciation) in order for the system to
be able to check against this maximum amount limit.

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?

Enter an area.

Error message extract from SAP system. Copyright SAP SE.