Only a single instance of the list transition exit can run at a time for any particular connector to the list structure. If additional monitored lists, or the user's event queue, become nonempty while the list transition exit is running, then the list transition exit will immediately receive control again after it completes its current processing.

Note that you can access the LEPL data area only while your list transition exit is running. If you want to save the LEPL information for later processing, make a copy of it before your list transition exit returns control to the system.

See Circumstances a User Exit Should Be Prepared to Handle for important information regarding additional situations user exits must anticipate.