I have created 2 operating units
Operating Unit A and Operating Unit B.
Defined Customized isupplier portal responsibility for OU A and OU B.
Then created PO from OU A and approved. PO is seen in the isupplier portal resp (A).
And created a PO from OU B and approved. PO is not seen in the isupplier portal resp (B), but it is seen in the resp (A).
Please let know if any setup is missed?