For inventory items, have the order number listed for each deduction and a job/lot# added when stock is added to the inventory. The job# serves a lot number so if an item is changed we know that the merchandise was produced under job#123 and the new order/inventory was produced under job#5567
This is essential for companies that inventory their clients merchandise to know when an item is replenished with a job number and a price for that job and for the deductions to show the job/lot number. This way if an item is replenished and the price changed the inventory value is reflected correctly. Also if a change is made to an item having the lot/job number you will know that prior to job#.... are obsolete or an old version.