0CALDAY with offset -1 question

Question

Hello SDN,
I am using BW3.5 query designer.  In my rows, I have 0CALDAY.  In my columns, I have Volume, and Prior Day's Volume.
I am trying to calculate the Prior Day's volume.
Example dataset:
2008.01.01     10     0
2008.01.02     7      10
2008.01.03     5      7
What's the best approach to do this?  I am thinking to either create a variable with an offset of -1 or using cell editor.  The problem I am having with using a variable is that I am trying to avoid using a variable screen for a key date.  If I use "Current Calendar Day" variable for 0Calday with an offset of -1, then it makes all the values in the Prior Day's Volume =  sysdatum - 1 which is not what I want.
Thanks!
Brendon

Answer 1

Hi Brendon,
Are you using a standar cube or is it a custom made?
If it is a custom made, one way to do it is the following:
  In your cube define a new key figure (ex: valueDayBefore)
on your update or dtp rules
assign the same key figure you used to your original key figure to valuedaybefore,
in the characteristics, make a formula for ADDING (1 day to 0CALDAY ).
Ex:
Source:
0CALDAY ___VALUE
04.04.2008___10
05.04.2008___20
06.04.2008___30
Cube:
0CALDAY ___VALUE___VALUEDAYBEFORE
04.04.2008___10_______X             
05.04.2008___20_______10
06.04.2008___30_______20
07.04.2008___X________30
Now you can easily do the query you need.
I still dont know how to do it via Bex only, that is the way we resolved succesfully one similar requirement.
hope it helps.
DGF