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Oh, an age-old problem. There should be a special file within the map that the campaign editor uses to work with the map. Unfortunately, I can't show it right now.
I just forgot to set who should play as which faction! :D
Added 50 minutes later
Okay, the editor apparently wants to kill me.
I deleted the test heroes from the map, adjusted the description, and voilà - the completed mission was removed from the campaign, and I can't set it because the editor doesn't see it again!:smile35: