USERS: SuperUser permissions are not being inherited

Hello

Can you please run this through your lab and let me know if its expected behaviour or if its a bug ?

I add a user and  grant the user "SuperUser" administrator permissions on a particular DC via using admin/internal via the admin portal

I then log out and login as that user new user that has "SuperUser" permissions.

I attempt to add a new user to the particular DC and grant them an admin type role.

This fails with message :-

* Cannot add permission. Only system super user can give permissions with admin role.

Since I am adding this user and granting them admin type role whilst logged in as a user with SuperUser role permissions, I'd expect this to work.

If this is not the case , how do I create a "System" user (similar to admin/internal) and grant SuperUser role permissions ?   

Something to mull over during your little holiday ;)