In the CA Automic Automation Engine v11.2 tasks in a Schedule cannot be edited for the next run after they have ended
Article ID: 115968
CA Automic Workload Automation - Automation Engine
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).
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An issue has been fixed internal in a higher version which fixes this issue.
Workaround: Restart Task. Then you are able to modify the task again.