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Edit the column's name to begin with "MID" or "FIN" depending on whether you are sending midterm or final grades. (This is necessary for Student Admin to be able to properly accept the grade data. If the "Column Name" field and the "Grade Center Name" field are different, the "Grade Center Name" field is the one that must be edited to begin with "MID" or "FIN.")
Also on the "Edit Column Information" page, make sure the Primary Display is set to a letter grade schema. Student Admin cannot accept numerical grade values.
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