under Array>Storage>Storage Group Dashboard you will see the following, in the dropdown under capacity you can change this for snapshot and SRDF and also produce a report in the bottom right, let me know if you have further q's.
Have you checked the capacity reporting with Unisphere is different than from symcli? if so it seems there is a bug.
Please verify and report, I created already an SR for this.
can you share the report and symcli you are comparing that shows the discrepancy for your SR? I can try to check it on another array to see if it is consistent.