HI Paulo,
R8 now ur in implementaiton stage of GRC,i mean in developement in this stage GRD developement system connect with ECC dev only,for that purpose create RFC destation from ECC developement system to GRC Develoment system this job will take about by Basis people only.
And ECC production system users are not required r8 now,u need only ECC system Roles,and su24 data of system.
And First of all complete all postinstalltion steps,after that IN ARA confgaration,once complete all installtion then u did the sync jobs
Regards
Ravikumar.ch