Print Sales Order Change

 When a sales order is processed, activity rules dictate that after it reaches status 540 an acknowledgement is prints automatically, acknowlegement is sent to the customer and the order is statused to the plant. This works fine. The problem occurs when the order comes back for changes (drawings - dates - etc.) and is rerouted through status 540 again. Only the line items at 540 get printed and because these are printed along with other orders, the acknowledgement goes out incorrect. How do others process their change orders? I was thinking about another status except we have so many now. Any