How many movies have Dieter Kehler and Heidi Ulmke collaborated on?

They have worked on 4 movies together! Their first movie together was Rosamunde Pilcher: Wo die Liebe begann (2006) while their highest rated movie together was Wer Liebe verspricht (2008). They have not worked together since The Engaged Woman (2013). They are most known for their romance films together.