Rails - Apr 2005 - Problem with multiple associations referencing the same table

I have an order object that starts out like this:

class Order < ActiveRecord::Base
  belongs_to :billing_address, :class_name => ''Address'',
:foreign_key =>
''billing_address_id''
  belongs_to :service_address, :class_name => ''Address'',
:foreign_key =>
''service_address_id''
  belongs_to :shipping_address, :class_name => ''Address'',
:foreign_key =>
''shipping_address_id''


When I attempt to use the same Address object for 2 or more of these values, 
the order object gets the attribute set ok, but when I save it only one of 
the associations is linked, the first one I set. Is this expected behavior?

I have tried many different things and I can never get more than 1 
association to save in the orders table, I can get different associations to 
save but never more than one.

-Jeff