What does Copy document to copy PO Impacts

Dears

I tried to copy PO using the function (Copy document) in Tools list, the new PO has been created is the same as the old one (as excpected) but when i enter to distrebution window in PO interface, I noticed that the requisition number is empty, therefore i couldn't receive the PO later. Please advise, is there any way to link the requisition to the new PO?

Noting that the new PO was entered into approval cycle as normal and i canceled the original PO.