Trailing 12 months in Essbase 11.1.2.2 ASO cube

Question

I have an outline with the first four dimensions being ReportingPeriod, Years, TimeView, Accounts -
ReportingPeriod
-Qtr1
--Jan
--Feb
--Dec
Years
-Y2012
-Y2011
-Y2004
TimeView
-Monthly
-YTD
-Trailing12Months
Accounts
-Revenue
I easily got YTD working correctly with regular and time-balance accounts with the following MDX -
AGGREGATE(PeriodsToDate([ReportingPeriod].Generations(2),ReportingPeriod.CurrentMember),[Monthly])
But whatever MDX I try to implement Trailing12Months, I don't seem to be able to make any headway. Any ideas? Thank you!
Edited by: user10655152 on Aug 15, 2012 3:34 PM
Edited by: user10655152 on Aug 15, 2012 3:35 PM
Edited by: user10655152 on Aug 15, 2012 3:35 PM
Edited by: user10655152 on Aug 15, 2012 3:36 PM

Answer 1

Thank you Dan. I had already successfully implemented the general idea suggested by Glenn. However, the problem there, as expected, was in the handling of TBLast accounts. The MDX below finally seems to give me trailing-12 months which also works correctly with TBLast accounts and the Qtr roll ups, although I'm not sure if this is the most efficient MDX possible for what I'm trying to achieve -
===Start MDX formula for member T12 of the outline earlier in the thread====
AGGREGATE(
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-11)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-10)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-9)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-8)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-7)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-6)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-5)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-4)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-3)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-2)),
          ([Years].CurrentMember.NextMember,[ReportingPeriod].CurrentMember.Lag(-1)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(11)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(10)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(9)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(8)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(7)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(6)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(5)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(4)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(3)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(2)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember.Lag(1)),
          ([Years].CurrentMember,[ReportingPeriod].CurrentMember)
, [Monthly])
===End MDX=====
Only 12 of the 23 lines above will return non-empty results, so this works for me. Also, CurrentMember (without any Lag) needed to be listed last, so the TBLast accounts would show up correctly. I suppose this would still not work if my accounts dimension had a mix of TBLast and TBFirst/Avg members, but since I only have TBLast, I am fine for now. Thank you Glenn, your initial idea really helped an ASO newbie in need of direction!