How many movies have Christoph Bennewitz and Wiltrud Pietschmann collaborated on?

They have worked on 1 movie together! Their first movie together was WIKDKK - Wenn im Knast die Knochen knacken (2006) and was their highest rated movie together. They have not worked together since WIKDKK - Wenn im Knast die Knochen knacken (2006).