Hi Annie,The place it would be configured is /cockpit/C23.
Unfortunately, the majority of fields are internal field names to Process Director (ie, have a different name than SAP). It might be the TaxJurCode, but I am not sure. Just display all the tax related ones in your Test environment (make sure you choose the correct field status group, for e.g. PONUM). The additional tax fields should become visible in the PD document header or line item. Transfer a new invoice after the change, just to be on the safe side as I am not sure the change is retrospective.
If this does not reveal the withholding tax code, you would need to ask Readsoft to map it for you. If it is not standard, they will likely ask for consulting. Currently, we want to see the scan date and populate this into field INVFO-REINDAT as the invoice is MIRO'd and we are being told that we need to engage a consultant..... grrrr.