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My suggestion would be identify all such lines and treat them seperately. My best guess is that you are going to load Open PO lines and On Hand Balances Seperately.
Ask business to close as many PO's with negative lines as possible if not all, so that you are left with minimum problem statement.
Once you have the right On Hand Balance loaded during cutover/ UAT, verify all open PO's with negative lines and do a issue out of inventory with an account and PO reference.
Keep the negative po's in archive for audit requirements in future.
Oracle does not have a concept of negative lines in the PO.