While you specify the substitution, it can happen that you will create conflicts. These are then shown with the red cross:
You can double click on each line and the software will show why it thinks there is a conflict. In case shown below, teacher is already teaching other class.
You can correct this in these three ways:
2. Or you can change the conflicting entity. You can do so by right click on lesson displayed in upper right corner, in row with teacher's timetable.
3. In some cases it is OK that there is red cross. For example you may really want a teacher to teach 2 classes in two different room in an emergency. So you can ignore this conflict.
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