Operating unit when using fnd_request.submit_request

Dears,

We recently upgraded to 12.2.5. I am trying to call the Import Standard Purchase Order program using fnd_request.submit_request. But I am unable to pass the operating unit.

I tried setting the OU using the following code, but it does not work

mo_global.set_policy_context('S', 3615); 

mo_global.init('PO');

FND_GLOBAL.APPS_INITIALIZE(1446,66859,201);

I am unable to set the OU for any conc program using fnd_request, not only Import Standard PO. . I think there could be profile values not yet defined.

Any help is appreciated

Regards

George