For sender systems, you have to set up an RFC destination for the RFC adapter.
Under the name of the old RFC destination ( ABAP_Old ) - formerly an ABAP Connection, now a Logical Destination - the system now calls the new RFC connection ( RFC_Adapter ) of type TCP/IP Connection for the RFC adapter.
The change to the target address ( RFC destination ) is transparent to the application but it alters the semantics of the RFC connection.
To return to the old destination, simply change the reference entry in your logical destination ( ABAP_Old ), for example from RFC_Adapter to ABAP_New .