Delivery notes aren’t the same thing as a packing slip.
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If I have a customer who orders 10 of item a, 20 of item b, and 1 of item, I then make an invoice for the customer. Now I want to print to packing slip, if I do a delivery note, I have to reenter all the information again, there is no way to link a sales invoice to a delivery note.
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The purpose of a packing slip is to include it with the order that is shipped but without showing the prices. For example, many of my customers order gifts for other people so they don’t want the price to be displayed. But they do want a packing slip enclosed with the order so that receiver of the packages knows that he/she received the correct item.