an "order picking cost" when viewed from the warehouse owner side; an "order picking fee" when the expense is passed on to the client in the form of a special fee.
definition of order picking: that part of the supply chain in which a small number of goods are extracted from a warehousing system in response to a customer request; most labor-intensive and costly activity of warehousing with its cost rising to over 50% of a distribution center's operating expenses. The added cost of picking may be passed on to customer in the form of an order picking fee and the item may be retrieved via either automated pick or hand-pick.