Event

Occurrence of a change of state in an object, which is published throughout the system. An event is an object type component. The list of possible events is defined with the relevant object type in the Business Object Builder. This list can be extended according to customer requirements using the delegation concept. The actual creation of the events added must be catered for. Each event carries information from its creation context in its event container. This information is available to the receiver of the event and can be used for event-driven control and communication mechanisms. Events can start, terminate or continue tasks and workflows. Examples of events: Invoice entered and purchase order released.

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分隔线上面是 SAP 标准文档中提供的说明
分隔线下面是我的翻译
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对象中状态改变的发生，通过系统发布。事件是对象类型组件。可能事件的清单在业务对象制作器中为相关对象类型定义。这个清单可以根据客户需求使用委托概念来扩展。添加的事件的实际创建必须满足需要。每个事件获得它的事件容器中的创建者上下文的信息。这个信息可以被事件接收者获得，并且能被事件驱动控件和通讯机制使用。事件可以开始、中止或继续任务和工作流。事件的例子：发票输入和采购订单释放。