Many schools will also want a letter from your current Dean. Sometimes that letter is supposed to be a recommendation, sometimes it is just confirming that you are in good standing. The information on PharmCAS concerning transfers is incomplete and unreliable. The best thing to do is to visit and read the websites of schools you might want to transfer to. If they don't have a policy listed, e-mail them or call and ask directly. It's just something that happens so rarely there isn't any good information compiled on it anyplace on the internet.
The one person that I know of who transferred successfully came into the P2 class at UWSOP. She would have been a P3 at her other school. She wanted to be closer to her family, who lived in Seattle.