The system watches for a customer to change the quantity of an existing item in an order. You can use the optional parameters within this element to further define the type of order or item to watch for.
Technical note: This element is triggered when the ScenarioManager receives an ItemQuantityChanged message sent by the SendScenarioEvent processor. For more information, see the sendScenarioEvent Pipeline Chain section in the Commerce Processor Chains chapter of the ATG Commerce Programming Guide.
