You can use a stored procedure as a data source for a DeskI report.
In a New Data Wizard or New Table Wizard, in the Specify Data Access window you do not select Universe radio button but Others and then you
select Stored Procedures from the drop down menu.
There is even a way how to use a stored procedure in a WebI report if you use a certain database:
(BOB member since 2003-11-27)