We wanted to remove the + and - (B+, B-, C+...) grades going forward. We cannot do it because the Valid Marks for the current year are used to determine the cumulative GPA. Grades in previous years that had the + and - were being excluded from the calculations. We had to add them back. If the system would support inactivating valid marks, we could leave them there for calculation purposes, but no one could use them going forward.