Requester Information not populating for PO Matched Invoice created through Supplier Portal

Summary:

We are creating PO matched Invoice through Supplier Portal but there is no scope to place Requester data in the invoice header section. We can see the requester is only appearing in PO line and invoice Line in supplier portal. Once the invoice is submitted and visible in the invoice screen , invoice team manually put the Requester from invoice line to header. We need Requester data in invoice header as our invoice approval workflow is based on the requester.

Please let me know how we can avoid the manual step and place the requester in the invoice header ?

Please note that as soon as we submit the invoice in supplier portal, the invoice is appearing in Payable Invoice screen before we execute the Import Payable Invoice Process, hence we don't have the option to copy requester name from Invoice Line and place in the invoice header in interface table by custom integration.