Although the exit names provided by your installation's current EXITS subparameter need not be changed to participate in measured usage pricing, you must insure that exit IEFU84 is not used by installation code to alter any fields in the type 89 records or suppress the writing of type 89 records.

If your installation uses exits IEFUSI or IEALIMIT to control the size of the user region assigned to a job step, IBM® recommends that your exit be changed to allow the region size for program IFAURP to be set by JCL used to execute this program.