Trial Balance Report- Bringing in 12th Period of Prior Year

I’ve been trying to build a subreport (basically a copy of the trial balance report) that would pull the 12th period ending balances for each account and pass that value to the standard Trial Balance. I can get the subreport to show values if I run it directly but the value never shows on the original. Am I missing something or is there an inherent problem with trying to get this value into the same report? I’ve attached the report (GL632EMS) and subreport (GL632e99) to this topic. If anyone can point to me what my issue is I much appreciate the assist!