You define the prestart job by using a prestart job entry. A prestart job entry does not affect the device allocation or program start request assignment.
The job attributes of a prestart job are not changed by the subsystem when a program start request attaches to the prestart job. However, server jobs generally change job attributes to those of the swapped user profile.
The Change Prestart Job (CHGPJ) command allows the prestart job to change some of the job attributes to those of the job description (specified in the job description associated with the user profile of the program start request or in the job description specified in the prestart job entry).