before system copy , we want to keep all the RFC interface :

here is the step:

 Copy all entries of the following tables to the transport of copy request:
R3TR TABU  EDIPHONE
                     EDIPO
                     EDIPO2
                     EDIPOA
                     EDIPOD
                     EDIPOF
                     EDIPOI
                     EDIPORT
                     EDIPOX
                     EDIPOXU
                     EDP12
                     EDP13
                     EDP21
                     EDPP1
With table Keys:  *
then save and release this transport.