A teacher tells me that they cannot enter the homework notebook. The message «course non-exploitable» appears.

If a course is not exploitable, it is because it has not been sufficiently specified in EDT. This may be an undistributed complex course, or a co-teaching course not identified as such. To solve the problem, go to EDT. Verify the date on which modifications were taken into account in the menu Parameters > DAILY MANAGEMENT > Placement (if needed, by selecting the first week of the year, so that homework notebooks can be entered retroactively). Then, from the list of courses, reopen the specifications window to select a distribution mode if it's a complex course, or right-click and choose Modify > Place in co-teaching.