Reasons of absence
Whether and how a cancelled lesson is to be counted for a teacher depends primarily on whether the reason of absence is marked as for counting or not.
You can define reasons of absence via "Absences | Reasons of absence". Quite often the reasons of absence are already defined by the school authorities and in some cases created automatically in Untis. In the latter case they cannot be edited.
Example: Counting substitutions
Open file demo.gpn and create two reasons of absence via "Absences | Reasons of absence"
Illness: Do not check any box. A cancellation with this reason should not be counted negatively.
Special leave: Check box "Count cancellations" A cancellation with this reason should have a negative result on the substitution counter.