My problem is that I do not understand how to write member names. I am confused about when you need to use [Dimension].[Level].[Member] and when [Dimension].[Member] is correct.

I used...

stevefromOZ (7/20/2013)

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Yep, I misread what you are doing. So when you select just those two members on rows with the same measure, they return values but when you use...

But I can't use a set to define a member ... I have to have some function.

So doing this

with Member [Items].[ItemType].[DepositsAndVouchers] as '{[Items].[ItemType].[Deposit],[Items].[ItemType].[GiftVouchers]}'

give an error