MOAC: Operating unit is getting passed to child request of concurrent program

Hi,

We are in process of upgrading to R12 from 11.5.8. I am facing following issue :

We have a custom generation program for invoice printing. This custom program is based on PL/SQL procedure which internally calls another custom program to print the invoice.

We are set both the programs to run in 'Single' mode. While running the parent program, we are setting the operating unit in 'Operating Unit' field of concurrent request paramter form.

The issue is with child program, the Operating Unit is coming blank for child program. Is there a way to set this. We are using submit_request API to invoke the child request.