MDX Calculation on SETS - set

Question

I have an MDX query where I am using a Parent-Child hierarchy where a property on any level have a specific values.
Now I want to take create a sets, that have each of these specific values and subtract them from each other
The query I have looks like this:
WITH
SET [OMS] AS
{
DESCENDANTS(
FILTER([ReportHierarchy].[Hierarchy].MEMBERS,
[ReportHierarchy].[Hierarchy].Properties( "Sum Code" )="OMS")
,,SELF)
}
SET [VF] as {
DESCENDANTS(
FILTER([ReportHierarchy].[Hierarchy].MEMBERS,
[ReportHierarchy].[Hierarchy].Properties( "Sum Code" )="VF")
,,SELF)
}
SELECT
{
[Measures].[Amount],
[Measures].[Budget Amount]
} ON COLUMNS,
{
[OMS],
[VF]
}
on ROWS
FROM
Finance
WHERE
[ReportHierarchy].[Hierarchy Name].&[Income and Balance]
which returns this result:
Amount Budget Amount
Nettoomsætning -126418831.1 -308192540.75
Vareforbrug 65415924.25 159307880.45
Now I want to do a calulation which subtracts SET [VF] from set [OMS]...
Anyone have any suggestions?

Answer 1

you need WITH MEMBER to create a new item in your left-most column. This new item can be set up to calculate the value of one item minus another. Here's a similar situation from an old query I wrote years ago:
WITH MEMBER [Actual Time].[MySubtraction]
AS '[Actual Time].[Week].[Week 5] - [Actual Time].[Week].[Week 4]', SOLVE_ORDER=80
SELECT {
[Location].[All Location].[Blah Blah]
} ON ROWS,{
[Actual Time].[Week].members,
[Actual Time].[MySubtraction]
}
ON COLUMNS FROM [CubeName]
WHERE ([Measures].[Whatever])
My MDX is getting rusty these days, so I have not tried to give you the exact query you need, sorry. Have a look at the documentation for WITH MEMBER to learn more.