用户出口是用户或供应商提供的可由 Message Broker 调用的函数。
User exits are user or vendor-provided functions that can be invoked by Message Broker. These invocations can be triggered by the following events
因此，这个上下文中不支持特定于供应商的关系函数。
Therefore, vendor specific relational functions are not supported in this context.
在Dynamic Query Mode中使用dmr包时，如果报告包含的表达式带有特定于供应商的关系函数，那么执行报告将会生成以下的错误消息。
When using a DMR package in Dynamic Query Mode, a report that contains an expression with any vendor specific relational function will produce an error message similar to the following.
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