Activity finish later than WBS element & finish date

What causes this issue?

The finish date that you entered for the activity is later than the
finish date for the WBS element.

System Response

You cannot adjust the dates from top to bottom.

How to fix this error?

Enter a finish date for the activity that is earlier or the same as the
finish date for the WBS element.

Error message extract from SAP system. Copyright SAP SE.