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The receiving clerk should have access to authorized purchase orders in order to make sure that only authorized shipments are accepted. Prices and quantities should not appear on this copy in order to increase the likelihood that the count of received items will be accurate.
The warehouse receiving department should have a copy of the purchase order, but its copy should not include prices and quantities.
Shipment receipts should be backed up by authorized purchase orders, not the warehouse manager's approval.
Having the receiving clerk work independently of the warehouse manager is not a control but is in fact a risk, because the clerk would be working without supervision.