We just solved an issue where a user had added a demo issue within a sandbox environment to a live sprint that was just about to start. Upon attempting to start the sprint, the Project Manager of the live project received an error stating he needed Administrative priveleges over the Sandbox project.
My question is: how do I prevent people that administer project A that do not have any priveleges for Project B in adding issues to sprints belonging to Project B? I do not want to remove the 'Sprint' field from the screen, as it's also visual feedback for the actual users of this functionality.