It is not possible to prevent the Project Lead to make changes to the project roles. In order to make changes to the project roles, one needs the "Administer Projects" permission in the permission scheme assigned to the project. When removing the Project Lead from this permission, it will not be able to make changes to the project roles anymore. This however also means it is not possible to make ANY configuration changes to the project.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.