First, he chooses the shipping order from a list.

Mr. Klaus is shown on the display which unit load belong to the shipping order and where they stand. With this information, he quickly finds the material to be shipped.
He scans the barcode of the unit load for confirmation.

By scanning the unit load it is confirmed, that the goods have left the warehouse properly and are on the way to the customer. 
Thus, the sales order for the logistics of the online shop is complete.