For any Payroll related inquiry, it is always preferable to mention the Country Code since many Payroll related elements are Country Specific, and posting in the Payroll Discussion Forum (the general one (SAP ERP HCM Payroll) or the Country specific one). Note that you should also visit the Payroll Wiki place as the information you seek may already be there (Payroll Spaces - ERP Human Capital Management - SCN Wiki).
As for WT /XXX, it would have helped if you would have mentioned the WT.
If it is in the /101 to /199 range, then you should look at the Cumulators 01 to 99 in table view V_512W_D (or through the WT Usage Report, t-code PC00_M99_DLGA20).
As for the others, many are Country Specific and refer to Employee Deductions or Company Contributions.