Task status

Task status

Hello Community, 
I have some template that are using resources and each resources option has a task related to it.
Now, i want to disable the checkbox of that resources based on the task status.
if a task has status resolved, closed or cancelled i want to be able to disable the resources  checkbox.
this would be a rules in the template. i have not found a way to get the task status.
any idea anyone ?

regards,
Martin

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