We have 2 items in our inventory, that show an SO for a negative amount. I cannot find an orders that have negative amounts and no orders that match the quantities. For example, we on hand 110 units of product A with SO of -15 and an available inventory of 125. The actual inventory is 110 units. We do have what we call drop shipments. These are products shipped directly from our factory to our distributors and are not part of our inventory, but get billed and process thru us. However, there are no shipments that match the amount. Any help would be appreciated.