How many movies have Marie Luise Lusewitz 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 Three Swedish Girls in Upper Bavaria (1977). They have not worked together since Drei und eine halbe Portion (1985). They are most known for their comedy films together.