How many movies have Raoul Retzer and Traude Krappl-Maass collaborated on?

They have worked on 4 movies together! Their first movie together was When the Mad Aunts Arrive (1970) while their highest rated movie together was Tante Trude aus Buxtehude (1971). They have not worked together since Tante Trude aus Buxtehude (1971). They are most known for their comedy films together.