What is the batch number for? Batch number is used for color-matching information. For example, if Slab #1 & Slab #2 are from the same batch (also called 'bundle' when talking about stone), they can be used as part of the same countertop.
How do I change a purchase order status to "not ordered"? On the Purchase Order Detail page, click on the Edit PO Info button and remove the date in the Order Date field.
How can I see who changed what? To view a list of the changes, click on the Purchase Order Number and select "View Change Log".