Hi Vimal,
Please check:
"System Copy for SAP Systems Based on SAP NetWeaver 7.1 Including Enhancement Package 1 Java (PI/XI)
SAP NetWeaver Process Integration 7.1 including Enhancement Package 1 - 2010/12/02" or 011000358700001317792010E.pdf
The best way to perform a system copy of a dual stack is to use sapinst with the backup/restore options. Install a plaine system an restore the db would not work. Sapinst exports also a lot of stuff from the filesystem repository.
1. Export actual SAP system using sapinst with option export ABAP+JAVA
2. Uninstall SAP+DB from actual server
3. Install SAP using option System Copy (Target system)
Thanks
Vikram