Hi Vijay,
Please check if you have active CIF integration model (ECC to APO) for Purch.Orders & Purch.Req at the two locations level. Also, for the transfer from APO to ECC you must have publications on APO side created for external procurement, shipment, delivery, etc..
I suppose that you have Tr.Lanes created between the two locations. For this Tr.Lanes you have to maintain means of transport (for example truck).
Please confirm.
Thanks, Marius