On the task window under Window Manager. Check if the protection is set to read only. If yes, change it to read write.
EDIT: didn't see the first screenshot as I believe it didn't load. Can you check if there is a calculation on that attribute?
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This is going to sound strange, but you shouldn't need to set the flag. When a reminder is triggered in a process, it is set to true by the system until the background service has processed the notification. The Is Active flag is then set to false.
Hope that helps