MDX Queries Return Different Results

Hi,

I am new to MDX and I have created a query listed below, this returns the correct information from the cube. However when I split the query into a CREATE SET and Query the data returned is wrong. I need to include the set creation in the cube but this returns the wrong information. I thought that information returned by these two queries would be indentical can anyone explain please.

Thanks David


SELECT
({[Time Calculations].&[Current Period],[Time Calculations].[Prior Year]}) on columns,
Filter (([Store].[Store No].[Store No].Members),
([LFL Month Store].[Month Lf L Store].&[Month LfL Store]) <> 0) on rows
from finance
where( [LFL Calendar].[LFL Calendar Hierarchy].[Year].&[2008].&[Qtr 1 2008].&[P3:April 2008] ,
[Measures].[GL Amount])

----------------------------------------------------------------------------------------------------------------------------------------

create SET [Finance].[LFL Stores List] AS
Filter (([Store].[Store No].[Store No].Members),
([LFL Month Store].[Month Lf L Store].&[Month LfL Store]) <> 0)

SELECT
({[Time Calculations].&[Current Period],[Time Calculations].[Prior Year]}) on columns,
[LFL Stores List] on rows
from finance
where( [LFL Calendar].[LFL Calendar Hierarchy].[Year].&[2008].&[Qtr 1 2008].&[P3:April 2008] ,
[Measures].[GL Amount])