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                   When 
                    sales orders are shipped they will create an invoice of the 
                    same number. As sales orders are entered they are checked 
                    to make sure there will be no conflicts in Sales Orders or 
                    Invoices. There is no change to the standard invoice entry 
                    system. 
                  With 
                    this enhancement it is not possible to keep items on backorder. 
                    When a Sales Order is shipped the items on the order, that 
                    are not shipped, are cancelled. (If they allowed shipping 
                    again it would create a duplicate invoice number). 
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