First step:
First, contact the Examination Office of the Faculty of Law at the University of Cologne to obtain a placement certificate for submission to the Student Secretariat.
Second step:
The application for a cross-entry programme is done via the Klips portal, on the homepage you will find the button "Bewerbungen" (Applications), in the selection of study programmes you choose "Studium mit staatlicher Prüfung" (Studies with a state examination) with the final goal of the first examination and in the study programme "Rechtswissenschaften" (Law). After acceptance, fill out the form "Antrag auf Fachwechsel" (Application for Change of Subject) and additionally indicate that you would like to study the examination programme in addition to the DTB.