Planetary Improvements

I put my modified lines of the xml into the /my games/mods/data/planeteryimprovements folder. Anything works just fine, I see 3 new improvements when playing a new game. However, there are 2 improvements which do not appear.

1. for internal testing, I removed the "tech requirement" from soil enhancement, but still cant build it. Ok I dont have the tech when I start a new game, but on the other hand, I removed the requirement, so whats the problem?

2. I added a new improvement wich is improving the planet quality by 20. For testing, I removed the tech requirement as in 1. Now when I start a new game, I see 2 red fiels on the planet, but cant build the improvement.

Maybe Im missing something, but when I get "soil enhancement", I have to make the improvement. WHen I get improved habitats, I got to improve the tiles. When I finaly get terraforming, I have to terraform the red fields in order to make them usable. Now I want 2 new techs for planetary improvement, the techs apprear just right after terraforming. Why do I see red fields when I didnt build anything, in a regular game, I have to build terraforming.