Followed scenario editor directions, Got a level not fond error.
I recommend you post any issues in the dedicated scenario editor section, pakfront will talk through the issues and work with people directly there.When I was trying to do the same, I realized that when shift+clicking the Prussian Kourier to add it to the battle OOB it was included in another additional corps.
http://www.norbsoftdev.net/forum/scenario-editor