How many movies have Franz Xaver Lederle and Rolf Olsen collaborated on?

They have worked on 15 movies together! Their first movie together was When Night Falls on the Reeperbahn (1967) while their highest rated movie together was Der Arzt von St. Pauli (1968). They have not worked together since Starke Zeiten (1988). They are most known for their comedy films together.