In the CA Automic Automation Engine v11.2 tasks in a Schedule cannot be edited for the next run after they have ended

Document ID : KB000115968
Last Modified Date : 14/11/2018
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Issue:
It is not possible to save changes in the task properties on a Schedule object after it has ended.
The SAVE Button stays greyed out.
This does not depend on the status of the task (OK, NOT OK, INACTIVE).

 Save_button_greyed_out
Environment:
N/A
Cause:
An issue has been fixed internal in a higher version which fixes this issue.
Resolution:
Workaround:
Restart Task. Then you are able to modify the task again.

Solution:
Upgrade the system to v12.x