Resolution:
"show message" command shows a message when the following are true:

- track_message_ids is enabled before the message is received by the EMS Server. Only when this option is enabled will the EMS Server keep track of the JMS Message ids when receiving messages.

- The command only works for messages still present in the EMS Server, not those already delivered to consumers.

Environment:
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All versions of BW
All OS

Resolution:
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You can run the following test and see the message as expected.

- Send a queue message when the queue receiver is not up and running. You will be able to see the message in "show message" command.
If you start queue sender and queue receiver at the same time, you will not see the message.

- Send a topic message when the topic subscriber has never started, that is, the EMS server has not created the durable yet.  You will not see the message in "show message". Once the topic subscriber has started once and the durable has been created, when you send the topic message (no subscriber is running) you will see the message. If you start topic publisher and topic subscriber at the same time, you will not see the message.