Threshold error after fltering.

Hello,

Before i start: I found these topics:
http://social.technet.microsoft.com/Forums/en-US/sharepointadminprevious/thread/a68a8997-0cad-44e1-97ea-f3b7a8990803

http://social.technet.microsoft.com/Forums/en-US/sharepointgeneralprevious/thread/632b012a-d1c3-421e-b10c-b7d641403db6/

My problem is similar (or the same) but the solutions says "If the first column of the filter returns more items than the List View Threshold". It doesn't! The list has ~7000 item. The first filter should get 2-300 of them.

And the only thing i get is an Error about beyond threshold limit and a correlation ID.

Thanks.

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