Hi David,
the main difference between pick-up and ship is the following:
In pick-up a service technician is picking the goods to store them in the trunk. This is a special logistics area (LOA) that can be maintained in the layout. When the service confirmation is done stock is consumed from this LOA.
In the ship case the intention is to really do a shipment to the customer's site. The only difference is that the inventory which is then at the customer's site still belongs to the own company. In the stock overview you can therefore distinguish between owner and custodian.
Again after service confirmation the stock is consumend.
Hope this answers your yestion.