MPFLSTxx members of PARMLIB contain statements that can affect the display, automation and retention of messages.

During MPF processing, the RETAIN®, AUTO and SUP parameters on an MPFLSTxx entry are processed first. Then either a user exit (specified by the USEREXIT parameter) is invoked or IEAVMXIT is invoked — but not both.

Note that if an MPFLSTxx entry does not exist for a message, the settings from the NO_ENTRY specification are applied.

Message Flood Automation message processing runs before MPF exit processing. Therefore, MPF exits can override the RETAIN, AUTO and SUP specifications set by Message Flood Automation.