We would like a utility added that would keep someone from putting in two different substitutes for the same teacher on the same day. We are running into some scheduling a sub and putting them in the system and then when the day comes that sub doesn't show up and another is called and then that one is put in as well without removing the original sub. We would like to see an error message pop up when the second sub is being added for a teacher stating that there is already a sub in place so that they know to go and remove the original sub before adding the new one.