I am trying to create a better map script since I feel the default ones are lacking. I've located the files needed to be modded, and somewhat figured out how to implement the .dds images on top of that. However, when I try to create my own option to be selected in the menu (Isolated option) instead of the default ones I get this thing:

error:
value 'Isolated' not in enumeration

If I edit the default folder .xsd, I won't get that error, but I am still not able to select it in game. I think I am missing something basic and stupid here, please help