I would like to lock the potential stage when it reaches a Closed stage (Closed - Won, Closed - Lost or Closed - Cancelled). I don't want to allow my users to reopen a Deal once it is closed. 

I have created a Blueprint for the Stage field which locks it, but once the Blueprint ended in one of the Closed stages, the field is editable and the user can move the oportunity into any stage.

Can this be done? Zoho support was not very helpful (as usual).

Thanks,

Robert