talking about Potentials (with Zoho CRM, Professional version), I need to forbid to certain users (or profiles) the possibility to modify a potential when it is in a certain Stage.

I'm thinking about a kind of "field based permissions for users/profiles": when the stage is set to "VALUE", the potential can't be modified by the user (or better, for users that belong to the same profile).

Is there a way to let the system work as described?

Thanks in advance.

AM