Hello Yuval,
After importing, you need to Implement the correct Operation by mapping the inputs & outputs of the RFC in the implementation section in SEGW ( Map to Data Source Option ).
Then generate Run-Time artifacts and this will generate the code to call the RFC as you are expecting.
Above will give the steps which you are expecting where frame work it self will generate the code in DPC to call your RFC and will map back the response as well.
Regards,
Ashwin