Metrics are created in sprints and PIs by what is in and what is out. I am finding that people who have access to more than their own work, will mistakenly put work WITHOUT talking to my team, in our PI after it has started, even to the point of selecting a sprint, AFTER is has started. I would like to lock my PI and sprint so that I must approve anything that gets dropped in from people outside our team. This ends up affecting our velocity and predictability.