It is not necessary for the application to issue the MQBEGIN call to start the unit of work, but if MQBEGIN is used, the call completes with CCWARN and reason code RC2121.
If the MQBEGIN call is used to try to start the unit of work, the call fails with reason code RC2012.
If the MQCMIT or MQBACK call is used to try to commit or back out the unit of work, the call fails with reason code RC2012.
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