Item defined for the Deliverables is Not Shippable
In Project contract in the Delivery Tracking System Cannot Initiate Shipping
when trying to check the check box 'Available for Shipment' flag getting message 'APP-OKE-248162 item defined for the deliverables is invalid for the following reason : Not shippable'
because of this cannot Initiate Shipping From Delivery Tracking System
please assist if any steps or process is missing
thanks in advance