How many movies have Ralf Wolter and Walter von Bonhorst collaborated on?

They have worked on 3 movies together! Their first movie together was Wenn die Conny mit dem Peter (1958) while their highest rated movie together was Was ist denn bloß mit Willi los? (1970). They have not worked together since Was ist denn bloß mit Willi los? (1970). They are most known for their comedy films together.