This exit is taken from the JCL conversion processor subtask in the JES2CI address space, from within module HASCCNVS at the following two times:

1. JES2 first gives your exit control after the converter has successfully converted a complete JCL job into its equivalent C/I text. The exit receives control once for each complete JCL statement unless the converter determines that any JCL statement for this job is in error. A complete JCL statement is considered to be a single JCL statement with all of its continuations. When Exit 60 is invoked, the user's JCL has been merged with the expanded JCL from PROCLIB, and all substitutions for symbolic parameters have been made. Therefore, all of the standard modifications that JES2 will make to the C/I text are complete when the exit receives control.
2. JES2 also gives your exit control after all of the JCL for a particular job has been converted to C/I text even if the converter did detect a JCL statement that was in error. It occurs at the return from the link to the converter, before JES2 creates the scheduler work area (SWA) control blocks. JES2 will not create the scheduler work area (SWA) control blocks until all the JCL for a particular job has been converted to C/I text.