different values between Relational and MOLAP in a sum measure... BUG?

Hello,
I'm working in a Windows 2003 Server, SQL Server 2000 and Analysis Services 2000.
I have created two models in Analysis Services (MOLAP):
- MODEL 1 gets info directly from the relational FACT table: "FCT_SALES"
- MODEL 2 gets info from a view with: "SELECT * FROM FCT_SALES"
FCT_SALES has a measure (sum and double - the column in the relational table is float).
This measure has 10 rows in the FCT_SALES.
Problem:
When we agregate the measure rows in Query Analyzer, MODEL 1 and MODEL 2 return 20. --> IT'S OK!
When I use Analysis Services (and ProClarity), MODEL 1 returns 20. --> IT'S OK!
When I use Analysis Services (and ProClarity), MODEL 2 returns 17. -->WRONG!!
WHY?
When I make Drill Through (Drill to Detail) in Analysis Services (or ProClarity) to see the rows that compose the value, and export them to Excel, I get the 20. --> IT'S OK!
So, WHY does Analysis Services (and ProClarity) give me 17 ?!?
If the SUM(rows) give me 20, WHY does Analysis Services give me 17 ?!?
Thanks.
Hi guys,
Yesterday nigth, I found the problem: something that shouldn't happen in the source info, happened! Murphy's Law )))
Analysis Services wasn't causing the info inconsistent.
Thanks anyway.