Now that you have learned how to process a usage order or an internal replenishment order in the NCAS, you must understand how the processing activities affect online item balances and at what points item balance updates occur. Normally, you will see item balances change as a result of multiple transactions. However, to illustrate the changes that take place, single transactions will be shown shown. Typically, you will not see the effects of an isolated transaction in the NCAS.