The application does not need to issue the MQBEGIN call to start the unit of work, but if MQBEGIN is used, the call completes with MQCC_WARNING and reason code MQRC_NO_EXTERNAL_PARTICIPANTS.
If the MQBEGIN call is used to try to start the unit of work, the call fails with reason code MQRC_ENVIRONMENT_ERROR.
If you use the MQCMIT or MQBACK call to commit or back out the unit of work, the call fails with reason code MQRC_ENVIRONMENT_ERROR.
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