How many movies have Ralf Huettner and Walter Gontermann collaborated on?

They have worked on 4 movies together! Their first movie together was Voll Normaaal (1994) while their highest rated movie together was Die Musterknaben (1997). They have not worked together since Die Musterknaben 3 - 1000 und eine Nacht (2003). They are most known for their comedy films together.