Enter an activity type o r group

What causes this issue?

In cost center planning, you can either go into planning with one
activity type or with a whole group of activity types. However, you
cannot go in with both simultaneously.

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?

Delete either the activity type or the group of activity types.

Error message extract from SAP system. Copyright SAP SE.