Webdynpro Service Call problem

Hi Experts

I'm a new bee in WebDynpro Abap. I try to import a service call (an RFC function from ABAP) into the component controller of my WDA application. What I understant is there supposed to have context node with the same RFC function name ( ie. I use the same RFC fct name) and parameters (what ever) inside the context node of the component controller after using Component/Create/ServiceCall. What happened after ther service all is I have context node with same fct name but no node nor attributes inside it. They are in attributes of the component controller instead.

Example :

1) Create/Service call fct BAPI_FLIGHT_GETLIST

2) Node BAPI_FLIGHT_GETLIST created in component controller context (nothing inside this node)

3) The parameters AIRLINE, DESTINATION_FROM, DESTINATION_TO, MAX_ROWS all appear as attributes in component controller instead of being in the node BAPI_FLIGHT_GETLIST

I try to understand, please help

Thanks a lot for you time