Web Analysis Studio users can construct liaisons between OLAP data and relational data sources. This navigation from OLAP to relational data is called "relational drill-through." After configuration, you can drill from the bottom of OLAP dimensions (level 0) to relational data.
Web Analysis Studio stores relational drill-through definitions as database connection properties of an Essbase database connections. The query result set is presented in the format of the SQL Spreadsheet described above. See Integrating OLAP and Relational Data.