How many movies have Heinz Paul and Willy Clever collaborated on?

They have worked on 2 movies together! Their first movie together was Student Life in Merry Springtime (1930) while their highest rated movie together was Wunder des Fliegens: Der Film eines deutschen Fliegers (1935). They have not worked together since Wunder des Fliegens: Der Film eines deutschen Fliegers (1935).