How many movies have Rosl Mayr and Wolf C. Hartwig collaborated on?

They have worked on 18 movies together! Their first movie together was Madame and Her Niece (1969) while their highest rated movie together was Bedtime Stories for Grownups (1974). They have not worked together since Schoolgirl Report Part 13: Don't Forget Love During Sex (1980). They are most known for their comedy films together.