Find out which channel triggers this situation in either the Initial Situation Values and Current Situation Values table views of the situation workspace, or in the Channel Summary workspace.
You can use the Batch Heartbeat channel parameter (BATCHHB) to reduce the opportunity for a channel to be placed in doubt. When this paramter is specified, a sender channel first checks if the remote channel is still active before it takes any further action. If no response is received, the receiver channel is considered to be no longer active. The messages can be rolled back and rerouted, and the sender channel is not put in doubt.
In-doubt channel problems are usually solved automatically when the connection is re-established. However, you can manually resynchronize the channel when necessary. For manual synchronization process, refer to IBM MQ (WebSphere MQ) online help.
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