def save(self, request, cart, contact, payment_module):
        signals.form_presave.send(PurchaseorderPayShipForm, form=self)
        super(PurchaseorderPayShipForm, self).save(request, cart, contact, payment_module)
        data = self.cleaned_data
        po = PurchaseOrder(po_number=data.get('po_number', ''), order=self.order)
        po.save()
        self.purchaseorder = po
        signals.form_postsave.send(PurchaseorderPayShipForm, form=self)
Save the order and the po information for this orderpayment
dataset/ETHPy150Open dokterbob/satchmo/satchmo/apps/payment/modules/purchaseorder/forms.py/PurchaseorderPayShipForm.save