How many movies have Franz Xaver Lederle and Sigi Rothemund collaborated on?

They have worked on 7 movies together! Their first movie together was Bohr weiter, Kumpel! (1974) while their highest rated movie together was Plem, Plem – Die Schule brennt (1983). They have not worked together since Starke Zeiten (1988). They are most known for their comedy films together.