With ABAP 7.50 , a new class CL_DYNAMIC_DESTINATION can be used to create a dynamic RFC destination( no need to create RFC destination In Tx- SM59) and can be used in calling RFC enabled function module.
The class CL_DYNAMIC_DESTINATION=>CREATE_RFC_DESTINATION can be used to instantiate a dynamic RFC destination.
The below necessary parameters can be passed to create RFC destination.
A demo program shows how it can be used.
SAPCODES 