HANA 2.0 DWF Task Chain - Missing task Types

We are trying to use the HANA DWF functionality. I have created the project based on DWF template and built backend, database and DWF modules. While creating a task chain, I am only see two "task Types" ("task chain" & "clear log"). Other options like "execute flowgraph" are not available. Is there any other setup required. Any help in this regard is appreciated.