One of our client have a problem with drilling data. When I click on measure I getting massage that report exceed 2500 row and i accept that the generated report is empty.
Which ReportPortal are you using (Admin > Settings > Version) ?
In ReportPortal there are settings you can change, for example max drill through rows (Admin > Settings > OLAP Report > Maximum Drillthrough Rows 2500)
Please hold control and click anywhere in the drill-through window. You will see the MDX at the bottom of the page. Please run the MDX in SQL Server Management Studio. Do you see any error? What is the MDX?