Note: As of July 9, 2018, Blackbaud's School Management solutions (which include Core, onBoard, onCampus, onMessage, and onRecord) are utilizing a new top level navigation. This primarily affects users performing administrative tasks-constituent navigation for most parents, students, faculty, and alumni will remain the same. We appreciate your patience as we work to update our documentation. If you are seeing this message, the content of this solution is still being vetted for possible updates. Please refer to this mapping document if you need assistance finding a task in the new navigation.
In onRecord > Settings > Attendance > Attendance Types there is a Type titled Absent Unexcused. When I click the editing pencil next to the bold Attendance Type it has a circle with a line through it which designates it cannot be changed.
The Attended Class and Absent Unexcused types are hard coded and cannot be edited/changed in the system. You can create new Attendance Types for the name you are trying to change it to and have the reasons for Unexcused/Excused.