Open Stack

Hello!

We faced a problem, when we let our beta users to our new cloud.
They constantly tried to create an instance and add network named EXT1,
which is a tenant network, and they not made any router and local subnet.
The VM creation is failed of course.

Our external network is flat type, mark as shared and also external, and
assigned to admin project.

Can we hide the option to add those (external & shared) networks (which
should be only used with routers) to instances by a user?

Thanks:
 Peter