Hi Sergio,
I published the SSAS-article on SQLServerCentral a while ago. You should find it here: http://www.sqlservercentral.com/articles/Linked+Server/63867/
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Concerning SQL Server 2008:
The Reporting Services 2008 has a new control called "tablix" ("table" and "matrix") which should behave much better than the matrix. However, I have not tried the example of my article within SQL Server 2008 yet.
Kind regards,
Martin