Shop on Behalf

Hi Friends,

I am working on SRM 5.0

i would like shop on behalf of User-X,I am user-Y

So i have assigned user -X in my (i.e. user-Y) attribute as Requester.

Now i am able to create SHC & PO behalf of user-X but I am not able to post Goods confirmation for the PO behalf of user-X

How i can post Goods receipt behalf of User-X, without changing Goods recipient in the PO?

Am i missing any setting? What else I have to do so that I can post GR for the PO.

Please advice.

Thanks,

San