Attempting to add hours that are not within the start and end date of the student, class, or group.
Hours cannot be added if they are prior to the student or class/group Start Date, or after the student or class/group End Date. Verify the Start and End Dates for both the student and the class/group and only add hours within these dates.
If the Class Start Date or End Date needs to be updated, you can do this in the Class Data tab of the class record.
If the Start Date or End Date on the student enrollment is incorrect, you can double-click the student's enrollment record in the Enrollment tab of the class record and update the dates so they are correct so you can then log the hours. Please note that the Start Date cannot be prior to the student's Enroll Date in the class, so if you need to make the Start Date earlier you will need to update the Enroll Date so it is not after the new Start Date.