Superseded SYSMODs

When one SYSMOD is superseded by another, SMP/E makes a record of this by adding the name of the superseding SYSMOD to the entry for the superseded SYSMOD.

When there is only one superseding SYSMOD, its name is saved in the LASTSUP subentry.
When there are several superseding SYSMODs, the name of the last one is saved in the LASTSUP subentry, and a complete list is saved in the SUPBY subentry.

If the superseded SYSMOD has not been previously applied, its target zone SYSMOD entry contains only the LASTSUP information. Such a SYSMOD entry is called a "dummy entry". Because the superseded SYSMOD had not been previously applied, SMP/E does not know what type of SYSMOD it was (function, PTF, APAR, or USERMOD).