[rt-users] On Approval notify owner - how?

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There's a ticket and one or more 'approval' tickets created for it automatically. The owner is therefore assigned later, after the 'approval' tickets are created, and probably BEFORE the ticket is approved. The problem: how to notify ONLY the ticket owner once it has been approved instead of notifying the entire list of Watchers (my present solution)?

Is there a way to update a ticked based on event in the linked ticket? Like changing AdminCC from group to user?