If the Order Manager thought that an item was in stock when it actually was not, or if you have set the program to not check inventory but you need to backorder one or more items, select the line item and click the Force button. The program will change the quantity shipped for that item to zero, and set the quantity needed equal to the quantity ordered. The next time you tell the Order Manager to fill backorders, it will attempt to fill those forced backorders if you have a quantity on hand.