Not able to select PR in Auto Create Form

 Hi Members,

I created PR and approved in R12. While creating auto create i am not able to select my PR. It is not showing any PR. But if i press clear and search i am able to select PR.

If i set profile option PO Allow Buyer Override Auto create find "NO" the buyer field is not editable and not able to select any PR. But in 11i if set this profile option "NO" the buyer field in  not editable and i can select PR with the buyer on which i logon.

Can any one elarify my doubt.

Please find the attachment for more details.