If you are travelling to more destinations during your business travel (i.e. fieldwork), and these are not part of the vacation days, please download the form (Anlage 1) at https://www.fu-berlin.de/sites/abt-1/formulare/05dienstreisen/pdf_dienstreisen/An1_DR_ABR-09-01.pdf

The travel department will ask you about filling out this form, but it is also possible to make a list of all your destinations yourself.