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  I can't make a modification because the period is sealed. What should I do?

If modifications are required after the ending date of the period, the period must be unsealed manually. To do this, go to the tab Grading > Evaluation periods > Calendars and grading periods, select the concerned class and double-click on the icon which is displayed next to the period ending date in the right panel. Once you have made the modifications, do not forget to seal the period again.