Thats one of the primary reason that i refer the orchestrate operators refernce guide and parallel job developers guide both open. If one doesnt work try the other.There is an error in the Parallel Job Developer's Guide in the Modify stage chapter. The name of the function that handles null values is incorrectly given as NullToValue(), which is the Transformer stage's function.
In a Modify stage the function you need to use is handle_null().
handle_null() is documented in Orchestrate Operators Refernce , page 13 33, under the modify operator section. But im not sure if everything is right with orchestrate documentation also
