Which field on the PO_WF_PENDING_REQUISITION_AMT CI updates ORIGINATORID on PSWORKLIST?

I'm sure this has come up before but I can't seem to find it. We are using a system user account to run processes like the Requisition Approval Workflow(PO_WFREQAMT). This process runs the app engine which calls the PO_WF_PENDING_REQUISITION_AMT component interface but when this is submitted the originatorid on PSWORKLIST shows the operid of the system account. I'd like to be able to updated this to the requestor. Is there a field on the CI that can be updated to accomplish this? Or am I stuck writing a SQLEXEC in the CI.Save property.