A customer has ordered a rack， a p650， two p630s， and two p615s.  During a conversation on installation planning， the pSeries technical specialist recognizes that the customer expects the rack to arrive as one unit.  However， the specialist knows that the p650 will be racked， but the other systems will arrive separately.  In fact， the other systems are CSU （Customer Set Up）. Why should the specialist immediately inform the customer that additional racking is the customer’s responsibility？（）