How many movies have Heinz Becker and Horst Sieger collaborated on?

They have worked on 1 movie together! Their first movie together was Wo der Wildbach durch das Höschen rauscht - Witwen-Report (1974) and was their highest rated movie together. They have not worked together since Wo der Wildbach durch das Höschen rauscht - Witwen-Report (1974).