Hi Gayathri,
You mentioned about "setting up Diaster recover (DR ) we are doing the mirror copy of the Source System to Target System".
How did you installed the Target System then?
Because it's a dual-stack system, if you use the system-copy method, you need to export the ABAP and JAVA stack separately (2 times), also the import-phase.
I hope this will help you.
Regards,
Andre