Information from the system to the user. Error messages are intended to help users recognize the cause of errors, so that they can continue working. Depending on the message type and whether they were issued from a primary window or a dialog box, error messages are displayed in the status bar or in a dialog box.

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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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从系统到用户的信息。错误消息的目的是帮助用户认识错误的原因，这样他们可以继续工作。根据消息类型和它们是来自一个主窗口还是对话框，错误消息会显示在状态栏或者对话框中。