At a glance

All subgroups in a division must have the same total lesson duration.

What causes this error

Even if the number of lessons matches across subgroups, the total duration (in periods) must also be equal. Otherwise, some students would spend more time in class than others during the same division.

How to fix it

Go to the Lessons section and adjust the duration of the lessons for the mismatched subgroup so that the total matches the expected value. Check for lessons with different durations across subgroups.

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