NO APPLICABLE DATA FOUND in BEx query

Question: Scenario: we have recently upgraded to BW3.5 from 3.0 with SP 11.
after the upgrade, we have problems with running queries on a multiprovider. When the queries are executed they return NO APPLICABLE DATA FOUND although there is data in base cubes for the same selecion conditions.

Did anybody come across a situation like this.

Any help would be greatly appriciated.

Thanks

Answer:
First check would be to rule out authorisation problems...

get a SAP_ALL BW user to run the query.
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