You won't be able to issue items to the shipment that is already in packed status. There is a service that check the status of shipment which is called inline in the method you indicated.
The right way would be create another shipment for the ship group, issue item to the new shipment which will generate a new invoice for the other item on your order.
Regards
Vikas
On Feb 6, 2013, at 12:11 AM, Deepak Agarwal wrote:
> I have a scenario:
>
> An Order has 2 order item. I packed one of them and clicked on 'complete
> pack'. It creates the shipment and invoice (and rest of the stuff).
>
> Now, I want to add the remaining order item to this shipment which I can do
> from "facility/control/AddItemsFromOrder?shipmentId=<id>"(It triggers
> issueOrderItemShipGrpInvResToShipment ) but this only modifies the
> shipment. My invoice still shows one product (though this shipment has 2
> products).
>
> --
> Thanks,
> Deepak Agarwal,
>
> Mobile: +91 9501190044