What happens when I update an Approval Routing Group?

The following article outlines what to consider when updating approval routing groups. It also addresses auditing approval group setting changes. 

Answer:

If a user made an edit to the settings of an approval group, it will impact who is responsible for approving a newly submitted request. It is important to note that if any requests were previously submitted and pending approval when approval groups were updated, those already submitted requests would adhere to the previous approval group settings/routing. The current approval routing settings will impact all newly requested orders only.