How many movies have Heinz Eckner and Otto Retzer acted in together?

They have worked on 3 movies together! Their first movie together was Die Kompanie der Knallköppe (1971) while their highest rated movie together was Tender But Cheeky Like Oskar (1980). They have not worked together since Ein Kaktus ist kein Lutschbonbon (1981). They are most known for their comedy films together.