Verify that synchronous and asynchronous service calls are logging invocation confirmation messages to console output, as shown in Figure 19.
验证同步和异步服务调用正在将调用确认消息记录到控制台输出，如图19所示。
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This is especially important when asynchronous invocation is used where the calling task has to look for the output of the called task appearing at a particular location to continue further.
After the IDoc is sent out, the XML contents of the output business object is returned, which contains the transaction ID for this ALE asynchronous request, as shown in Figure 43.