Using MD09 to pegging

Dear all.

I have some question for using MD09 to peg initial reservation.

I have 3 production order at the same day. Run MRP and the system will generate only one purchase requisition for 3 production order. I'm in progress by convert PR to PO, good receipt and complete PO. But when I use MD09 to peg from PO, the system said that that PO does not exist and I can't peg for this. What's wrong here or SAP does not support for pegging after PO be complete?

hope your reply

Thanks