How many movies have Karl-Eberhard Schäfer and Susanne Roggendorf collaborated on?

They have worked on 4 movies together! Their first movie together was Blindes Vertrauen (2005) while their highest rated movie together was Zwillingsküsse schmecken besser (2008). They have not worked together since Nein, Aus, Pfui! Ein Baby an der Leine (2012).