Check for existing registration before entering LOAs

Staff who process student leave of absence (LOA) requests should ensure that any registration for the term of LOA is dropped before adding the Leave of Absence row to the Student Program/Plan page. If a Leave of Absence row is added and registration exists for the term, the system will provide a warning message when the user attempts to save, but it will not stop the user from saving the change. Classes cannot be dropped once the Leave of Absence row is added without first making a correction to the Student Program/Plan page.