A empty map? You shure you did all like I wrote in previous post? Was hoping it was easy to understand. Have you created the mod the right way like in the GEM Editor sticky?
By the way, in the german campain, "Scorching Sands" and "Tobruk" are the only missions that need this to change units. In the other 3 missions we only need to change units save the "0.mi" and replace the corresponding file inside "game.pak".