not each process can do what another process can, thats why there are different process instead of just 1.
the batch number of the goods issue is not in the PO, but you just reference the PO in your example.
in the STO process with outbound delivery you can reference the outbound delivery in MIGO, so you can get the info from there, which means SAP can know the batch number directly from the reference document.
I dont know if it is possible through a BADI to take the info from the material document which is referenced via the PO history and default it into MIGO screens.
Maybe someone else has here a definite answer.