How many movies have Erich Engel and Heinz Salfner collaborated on?

They have worked on 5 movies together! Their first movie together was Mädchenjahre einer Königin (1936) while their highest rated movie together was A Hopeless Case (1939). They have not worked together since Viel Lärm um Nixi (1942). They are most known for their comedy films together.