Click on value correction in the "Teacher | Master data" window on the "Value calculation" tab to change the substitution counter manually.
You can increase the value of the substitution counter at a certain date (Type S: substitutions or Y: special duty) or reduce it (type C: cancellations).
You can also print the value correction via "Print selection | List type value correction".
If you enter in the type field "incrase + value" or "reduce value", then the substitution counter does not change but the lesson value.
The master data window of the teachers provides you with an overview of the counter status for all teachers of the school (for more details see chapter: overview substitution counter (master data window)).