Make Template tab "Actions" required

Hi. We have an OpenNebula of version. For the user templates we make the Action of powering off the VM after the time period. That Action should be mandatory for User after the deployment so he couldn’t change it or delete. But he should have an opportunity to create/change/delete his own Actions.

So the question is how can we forbid deleting of the first Action ,“hardcode” it for User?
It would be great if someone could give some sort of short manual for that problem in the reply.

Thank you!

Hey, anyone can help us?