Activity type not checked if there is no controlling area

What causes this issue?

The controlling area was not entered in the master data. Therefore,
the activity type that was entered cannot be checked.

System Response

The system allows the entry of an activity type, and also saves this
entry.

How to fix this error?

Enter a controlling area for the master data maintenance (order,
project).
When transferring depreciation to Cost Accoounting, the activity
type is important. You should enter a controlling area and a valid
activity type before this transfer takes place.

Error message extract from SAP system. Copyright SAP SE.