How many movies have Erni Singerl and Maximilian Vitus collaborated on?

They have worked on 4 movies together! Their first movie together was Der Komödienstadel - Thomas auf der Himmelsleiter (1975) while their highest rated movie together was Der Komödienstadel - St. Pauli in St. Peter (1977). They have not worked together since Der Komödienstadel - Lachende Wahrheit (1999). They are most known for their comedy films together.