[KotOR1] Editing custom items

[DatStarshipWontFly]

Hello, i have a little trouble editing robe i got from here

https://www.gamefront.com/games/knights-of-the-old-republic/file/sentinel-robes

Basically I need this item to have attributes of fully upgraded heavy exoskeleton( +13 Def, +2 Max Dex, +3 Str +3 Con), but everytime I change parameters in Kotor Tool item icon becomes white and armor skin itself changes to generic medium armor if I change Base Item parameter from Jedi Robe to Defense Bonus 7.  If i dont change Jedi Robe class but instead adding Defense bonus in properties, its stuck on 28 no matter how much Defense bonus i add in properties (must be 31).

I had no problems editing Revan robe to have heavy exoskeleton parameters in the past.