The details window on the right-hand side of the diagnosis window allows you to obtain further information about individual items by selecting the item in the selection window. The problem will be displayed in a separate timetable window.
The following example demonstrates the function of the diagnosis tool. Depending on which version of Untis you are using, the optimisation results may differ from the results shown in this example.

When the optimisation run is complete, you can see in the optimisation information window that the constructed timetable contains several core time violations (unscheduled periods with the time request „+3“). But you cannot see where these violations occur.
Open the diagnosis function ("Scheduling | Diagnosis").
Detach the "pin" from the timetable (button <Lock Type>). The class timetable now becomes an "accompanying" timetable, which means that the display in the timetable window is now independent from the active window.

Open the category "Teacher" and click on "Double NTP".
The details window displays all teachers whose timetable contains double NTPs.
Click on an entry in the details window. The accompanying timetable switches to affected teacher and the period in question is highlighted.

You now need to decide if you want to accept the displayed violations or take evasive action. One option would be to increase the weighting for "Avoid creating double NTPs for teachers" to enable the optimisation tool to place a greater emphasis on this function.
While working with the diagnosis tool, keep checking items to which you have assigned a low weighting as there could also be hidden input errors in areas often regarded as unimportant.