- -modifyworld.damage.take.group. not working

[vvswarhead]

hello, I try to make the players inside the groups could not PVP, i use:

| somegroup:
| permissions:
| - -modifyworld.damage.take.group.somegroup
| - modifyworld.*
| somegroup2:
| permissions:
| - -modifyworld.damage.take.group.somegroup2
| - modifyworld.*

but players can pvp between themselves (in groups)