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We (I found the issue, Chris created the repro) detected a possible bug using DirectSlice and MeasureExpression.
We just posted it here: https://connect.microsoft.com/SQLServer/feedback/ViewFeedback.aspx?FeedbackID=455732
The issue could be very dangerous resulting in wrong query results on cells affected by DirectSlice property and MeasureExpression, depending on the order of the MDX query sent to Analysis Services. We included a complete repro to the bug posted. This behaviour has been tested on both SSAS 2008 and SSAS 2008 SP1.
What I would like to understand is how to use DirectSlice without worrying about this issue...
Please vote the bug if you agree it is dangerouse. I would like to get some feedback from MS too...
UPDATE October 16th, 2009: the bug is not a bug, it's by design - explanation on this post.
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About Marco Russo (SQLBI)
Marco Russo is a consultant, writer and trainer specialized in Business Intelligence with Microsoft technologies. He runs the SQLBI.COM website, which is dedicated to distribute resources useful for BI developers, like Integration Services components, Analysis Services models, tools, technical information and so on. Marco is certified as MCT, MCDBA, MCSD.NET, MCSA, MCSE+I.