Lot Number From Delivery Onto Invoice

How can I have the lot number that appear on the delivery, also appear on the invoices. This will help the warehouse pick the product more accurately. Currently on the invoice screen, the LOT number columns shows up but the Lot Number information is not present. I am assuming once this is done, the information will be able to display in the crystal form as well. Currently, if I grab that field it displays blank,

Please advise.