Hi Paranthaman,
Did you use the database-dependent method of system copy? Even so, it should have overwritten your QAS schemas, not just added to them. However, for SQL Server, this method of system copy is not the primary recommendation. For now, you can probably fix it as Martina suggests, but next time I highly recommend that you use the database-independent (aka detach/attach, or backup/restore) method of system copy for SQL Server. It is faster, and it does not result in this kind of problem. It works for both ABAP and Java stacks (and dual-stack), though since you are operating in a dual-stack environment, you must be certain to follow the instructions from the ABAP+Java system copy guide. With this method, your database will be copied by restoring a backup from production over your QAS database (overwriting it completely in the process), and your Java system will be exported and them imported using the SWPM tool.
Regards,
Matt