I have a subordinate who goes behind my back to discuss my credit decisions with my manager when she disagrees with my instructions. What is the best way to deal with this?

Answer: Head on. Confront your subordinate and tell her that you do not want her going behind your back to your boss. Hopefully, your manager is backing your decisions - and if she is not then that is a different matter. I would also address this with problem with your manner. I recommend that you explain that when they discuss the credit decisions you make with your subordinates that your manager is undermining your authority. Suggest that when your subordinates come knocking that he invite you to join the discussion as a way to discourage this inappropriate behavior.