If the WaitInterval field is set to unlimited on an MQGET call, this will keep any files opened by the SEP locked and, therefore, will lead to locks on the file for any other SEP sharing this file. This lock is only released when the Run Time System takes control again, but that will not happen until an MQ message is received.
Full article: https://portal.microfocus.com/s/article/KM000006544
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