User and Role - equal Ids should not be possible

Hi there,

there is sometimes a problem, when an admin inserts a role with an id
which is already existing as user-id.

The Role gets inserted without error. But for the user with the same id
in the assign-role field only the standard roles are presented. Other
special roles are gone for this user.

I think the case where a role gets introduced which id already exists as
an user-id should raise an error.

ZMS 2.10.1-31

Regards
Peter Zechmeister, Weboffice, JKU