Hi Ken,
You absolutely can report on Payroll deduction details. If you look in the QRASP directory for a file called PRINFO.DOC, there is a Word document that contains the list of all the accessible deductions and their associated sub-detail IDs. USPR reporting requires a different format than most programs.
The second half of this document shows a sample report that should prove useful as to setting up the formulas required for your report, etc.