How many movies have Dieter Landuris and Sigi Rothemund collaborated on?

They have worked on 9 movies together! Their first movie together was Der Eindringling (1990) while their highest rated movie together was Katie Fforde: Mein Wunschkind (2015). They have not worked together since Katie Fforde: Entscheidung am Meer (2016). They are most known for their comedy films together.