Column expression @ dasboard level not divideing by correct totals.

Question

Having a problem with a column measure at dashboard level. I read a post regarding using a union to fix… but wasn't sure that was the right approach for this issue.
We have columns 1, 2, A, B, C, values for A and C are within different Fact Dimensions, but do relate back to the common dimensions
Column A only shows values that are > 0, which limits back values on column C
Colman B uses an expression of C/A.
We have table view result totals on Row 1 and 2
Columns A & C are correct at the total levels, however column B isn’t. it appears that the C value for the expression ‘A/C’ at the total levels is a sum of all the rows for that fact not JUST the rows that match the A > 0 filter.
Expect this:
A     B     C
10     3     30
20     3     60
30     3     90
But get this:
A     B     C
10     3     30
20     3     60
30     *4.8*     90
When we change the filter to A >=0 we see extra values in the C column
A     B     C
*0*          *15*
10     3     30
20     2     60
*0*          *40*
30     4.8     145
I was thinking that I need to modify the column expression with a case statement to limit back the values or something but wanted to put this out there in case I’m missing something or aggregate function I just don’t know about to get back the expected results…
Running 7.9.6 on 10g
This was the post i was referring to... OBIEE Answers - Divide two columns from the sum of a union
Edited by: jeremy21 on Dec 9, 2010 1:45 PM

Answer 1

I'm assuming like your problem is in you are using a union request for getting the grand total. But in Grand total you aeg etting the results wrong.
IF yes, then your solution might be this,
in column B in the grand total criteria, use the formula as,
sum(C by)/sum(A by)
and apply the filter as A>0