Title: Defining Roles

Describe the issue:

"Organizational entity already exists with [GroupImpl:'manager'] id, please check that there is no group and user with same id"

This message is expected as a user shouldn't belong to a group with the same name as it's user name/login , e.g. user as admin and group as admin . It is explained in this Bugzilla [1]. So it would be good to add to the doc this information, so that users will not create users/groups using the same names.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1049649

Suggestions for improvement:

Additional information: