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You must continue to pay the mandatory semester contributions during the semester of leave, but not the tuition fee. After your leave of absence has been approved by the Student Administration Office, you can find the invoice for the mandatoy semester contributions in the student portal in the "Enrollment" request for the corresponding semester. The invoice for the full semester fees will automatically be cancelled by the Student Administration Office.
Please see the information on this point on the website "Leave of Absence" under "Invoice for Mandatory Semester Contributions".