Rails - Nov 2005 - model classes into module = superclass mismatch

Hello.  I''d like to put all my data model classes into a module to
avoid name
clashes with other classes.  However, when I do so, I get a superclass 
mismatch error.  My class hierarchy for the class in question looks like 
this:

class ViewCTI < ActiveRecord::Base
end

module ORM
  class Molecule < ViewCTI
  end
end

I load the model classes from the ApplicationController class
class ApplicationController < ActionController::Base
  model :orm
  layout ''layouts/standard''
end

When I try to execute a controller I get the following error:
TypeError in <controller not set>#<action not set> 
superclass mismatch for class Molecule

RAILS_ROOT: .
Application Trace | Framework Trace | Full Trace 
#{RAILS_ROOT}/app/models/orm.rb:51
#{RAILS_ROOT}/app/controllers/application.rb:4
This error occured while loading the following files:
   ./app/controllers/application.rb
   => model orm.rb
   orm.rb

Any ideas why this might be happening?  Are there any special considertations 
to be kept in mind if collecting the model classes in a separate module?

Thanks

Luca