How to calculate an average of YTD measures?

Question

Hi all,
I'm working on BPC 10 for NW.
We use an account-type dimension for Personnel inventory (Personnel to fixed-term contracts, to permanent contracts, number of executives, staff etc.).
The corresponding ACCTYPE is AST because people are seen as a balance sheet account measure. So the measure, even if we're in periodic in our model, is stored as a YTD value.
I want to calculate a average with those measures, for instance the average number of contractors from january to the current month, with a member formula. I can't manage to do that with a calculation because I can't add values of YTD measures: when I try a formula like ([ACCOUNT].A1 , [MEASURES].[YTD]) it returns the same value as the periodic value. Whereas the formula works with EXP account type.
The formula I'd like to have in the end would be something like that:
iif(isleaf([TIME].currentmember),avg(YTD(),([Measures].[PERIODIC],[ACCOUNT].[G102])),[TIME].currentmember.lastchild),solve_order=5
This formula works in a previous version of BPC (5.1) but not in BPC 10.
Any idea?
Thanks very much,
Sébastien.

Answer 1

Assuming the job always starts at mid-might, you can try something like this:
WITH t AS
(SELECT to_date('01-JUL-2011 07:25:31', 'dd-mon-yyyy hh:mi:ss') AS end_date
FROM dual
UNION
SELECT to_date('02-JUL-2011 07:10:58', 'dd-mon-yyyy hh:mi:ss') AS end_date
FROM dual
UNION
SELECT to_date('01-AUG-2011 07:16:24', 'dd-mon-yyyy hh:mi:ss') AS end_date
FROM dual)
SELECT trunc(end_date, 'mon') AS MONTH,
        trunc(end_date, 'mon') + avg(end_date - TRUNC(end_date)) AS AVERAGE_TIME
FROM t
GROUP BY TRUNC(end_date, 'mon');