Several safety mechanisms are implemented in Untis MultiUser to ensure the consistency of the data.
For example it is not possible to change master data and lessons during an optimisation of the timetable in the same term. The user receives a message if his actions cannot be performed.

For the following actions the user has to be the only one in the system:
| • | Import of data |
| • | Import of departments |
| • | Editing of licence data |
| • | Settings (school data, time grid, etc) |
| • | "File | New School Year..." |
| • | Creating or editing of terms |
| • | Optimisation of more than one term |
| • | Entry and editing of holidays |
| • | Data-Entry Wizard |
In some cases (e.g. holidays) it is possible to open the respective windows and dialogues if the user is not the only one in the system. However, it is not possible to change data.
You can log out active users to gain exclusive access to the database (see chapter " Logging out users").