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  Can we manually correct a calculated average?

Yes, it is possible to correct the average directly on the report card if the option Allow the correction of the student's overall averages is ticked in the tab Body of the report card, frame Details of the averages in the report card mock-up.
To correct the average, enter below the average in the box Correction the number of points to be added or deducted (when necessary, precede the value with a minus sign). The corrected average is displayed on the report card, in the results tables and counts for the ECTS if you authorize the catch-up via the overall average.