I am not familiar with Country Code QA, but if you are dealing with a Standard Technical WT and there is no Outflow/Inflow already set-up, you will have to create Custom Technical WTs (such as /Xxx for the Output, and /Zxx for the Input) for that purpose and the PCRs to genenerate and process them.
Find the part of your Payroll Schema where processing will differ if this pay is Retroactive or Current, since you'll have to add your PCR to generate the Output in the Retroactive Payroll Calculation part.