I can not add children to a permission

[alexsantm]

I created an admin user, and common user. I created a rule for both profiles. But, when i want to create a permission, i can not write, or choose "children" from permission/create. Could you help how can I add a valid permission, for example, for a common user can visit a view???

[tonydspaniard]

@alexsantm if you could provide a PR I would be very happy to merge!