Dep.area & missing in mean value calculation (Correct)

What causes this issue?

Depreciation area &V1& is needed to determine the mean value. However,
depreciation area &V1& has not been defined in the chart of
depreciation &V2&. Depreciation key &V3& cannot be used.

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?

a. Define the chart of depreciation correctly
or
b. Correct the formula for determining the mean value.
For the time being, you cannot use the mean value key &V3&.

Error message extract from SAP system. Copyright SAP SE.