After System Copy (PRD to QAS), problem applying license on target system

Hi,

I'm trying to copy PRD to an existing (overwriting) QAS system.  Both systems are ECC6.0 running on Windows 2008 R2 and SQL 2012.  Here are the steps I took so far:

1. Backup the DB of the PRD system.
2. Stop the QAS instance.
3. Restore the DB to the QAS system.
4. With SWPM, run the "Data Refresh or Move" tool.
5. Choose the Homogeneous System Copy option.

I'm having trouble applying the license on the target system after a system copy.  In SLICENSE, the system number on QAS got changed.  It is now the same as PRD.  So the existing license file doesn't work. Then I tried to request a new key but can't.  It won't let me change the System Number.  Is there a step that I missed?

I used to perform the same steps on our old R/3 system.  I could just use the existing license file without any problem.

Thanks.

Henry