Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods changing skill names and descriptions of skills

you sure it's that sraightforward? This setup for example:

original spell:

new entry "Projectile_FlareStart"
type "SkillData"
data "SkillType" "Projectile"
data "Ability" "Offensive"
data "Element" "Fire"
data "ActionPoints" "8"


duplicate:

new entry "Projectile_FlareStart2"
type "SkillData"
data "SkillType" "Projectile"
data "Ability" "Offensive"
data "Element" "Fire"
data "ActionPoints" "4"


SkillSet.txt:

new skillset "Class_Wizard"
add skill "Projectile_FlareStart2""
add skill "Target_TargetedOilSurface"
add skill "Projectile_PoisonDartStart"
add skill "Projectile_StaffOfMagus"

Works in so far that i get the duplicate spell available in the game when i'm a wizard, but no changes that i make to stuff like action points in the duplicate spell has any impact on the game, only changes to the regular spell has any effect. I can't remove the original spell either without making the spell unusuable. How do i sort of disconnect the two from each other?