Actually, you wouldn’t have to generate a PO number in your SAP System, this PO # would be created here in Brazil and I would ask the person in charge of Invoices if they can replace QRXXX for Sony Brazil’s PO # (I would send this number by email).
If replacing QRXXXX for Sony Brazil’s PO # is impossible, please let me know so that I can give this feedback to the person in charge of this project.