Shipment Cost is not Puling through during GR

Hi Experts,

We have two PO's for 2 different plants (in same Co.Code) with different inbound delivery numbers and subsequent shipping and cost documents. Process of creating inbound delivery, shipment and shipping cost is identical with same shipment stages, cost item categories etc. For one PO, system is picking up delivery cost (DCGR component same as GR doc. no) and for the other it is NOT. We are using MB0A to do a GR with ref. to Shipping notification (Inbound delivery). I have checked every thing but could not figure out the reason as why there is no shipping cost component for a GR document? Any help would be appreciated. I have also found this behavior for two other PO's for the same plant so I don't think it is anything to do with plant no's or shipping points.

PO without Cost:

Thanks,

Salman