They've made it far more complicated than it needs to be.
Got some slight success so far by setting the formation to any, position to any, CA at 1 star and PA to 3 stars, select the scout, select the same nation/nations as the scout has knowledge in, then set to ongoing.
Making the settings anything but this will turn up blanks everytime for me.
Edit - forgot to add select Transfers and Loans, not just one or the other.