I've been doing some research, and I haven't found a way to restrict who one can choose as an approver when one puts an article in the Knowledge Base.

What I'd like to be able to do is to make it so that, say, if Joe reports to Bob, only Bob can approve Joe's articles.

As it stands, it looks to me like Joe could make himself the approver-which is not something I want.

Is there a way to do this?