Reporting Services - Analysis Services - Displaying Dimension Members As Columns

I think I've seen a similar post on a blog or on the forums - but it seems like this should be possible -

I have an MDX query - that works fine in SQL Enterprise Manager, and has my dimension members on columns, and my measures on the rows. When I try the same query in Reporting Services, I get the error:

"The query cannot be prepared: The query must have at least one axis. The first axis of the query should not have multiple hierarchies, nor should it reference any dimension other than the Measures dimension..
Parameter name: mdx (MDXQueryGenerator)"

Although it works when you pivot the view, I really need my data presented with the members on the columns and the measures on the rows. Another forum post mentioned using the SQL 9.0 driver, but I can't see this listed anywhere (the only one I see is the .NET framework Data Provider for Microsoft Analysis Services).

Here's what my query looks like -

SELECT
{ [Time].[Month].&[2006-09-01T00:00:00] ,
[Time].[Month].&[2006-10-01T00:00:00],
[Time].[Month].&[2006-11-01T00:00:00],
[Time].[Month].&[2006-12-01T00:00:00]
} on COLUMNS,
{
[Measures].[Unique Users],
[Measures].[UU Pct 1],
[Measures].[UU Pct 2],
} ON ROWS
FROM [Cube]



Any ideas?

Thanks,
Arjun