This document discusses using drillthrough functionality in SQL Server Reporting Services to view underlying transaction details from aggregated OLAP data. It begins with an example business scenario where a report user wants to drill into product sales data to see the individual transactions. It then covers preparing the reporting environment, cloning an existing sample report, enabling drillthrough in the OLAP cube, and creating a target report with an MDX DRILLTHROUGH statement to retrieve the transaction details and link it to the primary report for drillthrough functionality. The document provides details on configuring both reports to meet the example requirements.