How many movies have Oliver Biehler and Uwe Janson collaborated on?

They have worked on 5 movies together! Their first movie together was Ein Albtraum von 3 1/2 Kilo (2002) while their highest rated movie together was Weihnachtsmann gesucht (2002). They have not worked together since Lulu (2006). They are most known for their tv movie films together.