Evaluate iif in a MAtrix

Does anyone know why this IIF statement only evaluates once when it is in a Matrix but works ok outside the matrix ?

=IIF(LTRIM(RTRIM(Fields!USERDEF1.Value)) <> ("OTHER")
AND (LTRIM(RTRIM(Fields!USERDEF1.Value)) <> "KEY ACCOUNT" AND SUM(Fields!ID0_3_MTHS.Value) >0 )
 ,Fields!NoinGroup.Value, SUM(Fields!ID0_3_MTHS.Value))
NETFOCUSAsked:
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Nico BontenbalCommented:
Depends on the layout of you matrix. But shouldn't the formula be:
=IIF(LTRIM(RTRIM(Fields!USERDEF1.Value)) <> ("OTHER")
AND (LTRIM(RTRIM(Fields!USERDEF1.Value)) <> "KEY ACCOUNT" AND SUM(Fields!ID0_3_MTHS.Value) >0 )
, SUM(Fields!ID0_3_MTHS.Value) ,Fields!NoinGroup.Value)

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Now you're only showing the sum if it's <= 0. I you need further help please provide a small sample of your data, the layout of your matrix, the desired result and the version of SQL Server.
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NETFOCUSAuthor Commented:
I had to add another column group with a constant value in it an now it works.
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NETFOCUSAuthor Commented:
Making this change worked.
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