Does your client have a support agreement with Oracle?
They will need to get the media containing the IBM i 7.2 or 7.3 - compatible JDE objects as well as Software Protection Codes in order to run JDE software on the new system.
You cannot save and restore the V6R1 Oracle-supplied program objects from the old system and restore them on a newer version of the Operating System, since they have Observability removed and the restore will fail.