Ancestor permissions
Often, you may wish to grant a user the right to access components using categories that are not included in the component’s parent, such that, permissions to a component's ancestor tree are not explicitly granted. In this case, the system automatically grants operator permission level read-only access to all ancestor components in the component tree. Otherwise, a user would be unable to navigate to target component in the Nav tree.
This automatic ancestor permission level assignment is done by the station periodically, but you can force it at any time with a right-click Update action on the CategoryService node in the Nav tree.