RFC call from NW studio

hi all,

There is an error when I use SAP Connectivity from NW studio.

1.I can see all the function listed.

2.I choose one function (such as "BAPI_SALESORDER_GETLIST")and then clicked "finish" button.

3.the error box jumped out "<objekt> <rfc><BAPI_SALESORDER_GETLIST> nicht gefunden".

why?

and the icon behind the function is an yellow triangle.