There is no federal requirement. Other posters have noted that there are requirements in some states. In addition, OTS supervised institutions are encouraged to pay greater attention to the order of payment in connection with ODP programs. I suggest you re-post your question in your state's forum and, if you are OTS supervised, indicate it in your post.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.