Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
Both affected managers should be in sync that the new role is the best, highest use or escalate up the chain to make a determination. The manager wanting to recruit the person is responsible for not causing a disruption. An informal conversation to see if someone is interested is fine, but there should be no active recruiting prior to getting in sync with the existing manager. The timing of the move should be decided by the existing manager in consultation with relevant parties.