Never used creation kit before and thought id have a go at changing some damage values on this overpowered mod i have.

Changed all the damages fine the problem is saving it, all i want to do is overwrite the mod with my tweaks.

The option comes up to save as esm or esp, i call it the same and click save it the data folder and it wont allow it.

If i call it something else and start the game nothing appears, even if i activate orginal mod and my tweaked mod last in mod order it doesnt work.

This is probably a stupid question but any help would be great