[7.0/trunk] Address fields doesn't change to readonly when using parent address

In the partner form, when you create a contact that has a parent company, there's an option to use the same address for the children. If you mark this check, street, street2 and contry_id fields become read only, but it doesn't happen with zip, city and state fields, creating an extrange view semi-modifiable and provoking confussion in user.