Change a student's enrollment date for a group course.
Regardless of the start date of a course, a student's class attendance can only be entered from his or her course registration date onward.
To change a student's enrollment day for a group course, it is first necessary to enable editing of it from Configuration→ Settings→ Course-related settings→ General settings, by placing a check mark on the option "Allow editing of course attendance start date."
Going then to Didactics → Group Courses and clicking the icon "Students enrolled" on the row of the course in question by clicking the edit icon on the row of the student in question.
It will be possible to change the Data of beginning attendance to the course and click the Edit Subscription to save the operation.