Not allowing assignees to exclude tasks

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    Hi Guys

    We have just joined this formidable group and we need some help

    Does anyone could give some clarification whether is possible not allowing an assignee to exclude a task he or she has not created?

    For example if user Jhon sends a task to user Mary we think it is interesting Mary doing any activity but not to erase that task.

    Looking forward to hearing from you

    Kind Regards