Does anyone know of a best practice for locking down an opportunity after it is closed won? We want to prevent our sales people from changing the amount or name of the opportunity. Security suggests that I change the record owner but that will mess up our reports. I also thought about using record types and creating a read only page layout but it does not appear that I can make all of the fields read only.

My best idea right now is to create an sforce control that would change the record type and write the opportunity name and amount to a text field on the opportunity. Then display a page layout with that text field as read only and no other fields. Sounds like a lot steps. Any other ideas?

Thanks,

Eric