Hi Shoval,
When you say Reporting Server, do you mean Cisco Unified Intelligence Center (CUIC)?
The UCCE sandbox is on version 9.x and does not include CUIC.
The PCCE sandbox is on version 11.5 and has CUIC.
The UCCX sandbox is on version 10.6 and also has CUIC.
CUIC is the same for both UCCE and PCCE, so you should be able to use the PCCE 11.5 sandbox.
Thanx,
Denise