@kcowen - Where are you looking for the grades? Stored grades are found in the Historical Grades section for the student. You can also see them in Quick Lookup as long as you have the Quick Lookup Preferences set to Historical for the appropriate term.
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You can also export them out. Go to Setup/System/Grades/Export Historical Grades. Then enter the Store Code that you stored them with and the fields you want to export such as:
Open this in Excel and you will see ALL the grades you stored for that marking period.
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