Since Untis 2019, you can also import teachers' absences from WebUntis. Abesnces entered in WebUntis by teachers who have the respective rights can be imported directly to Untis.
If an imported absence collides with an absence already created in Untis, you will get be asked, if the absences should be combined. If you anwer with "Yes", one absence is created, if you say "No", two separate, overlapping absences will be created.
Create one and the same absence either in Untis or in WebUntis, never in both systems. Change an absence you created either in Untis or in WebUntis, and export or import the changes into the other system. Do not carry out the changes in both systems.