When one SYSMOD is deleted by another, SMP/E makes a record of this by adding the name of the deleting SYSMOD to the DELBY subentry of the deleted SYSMOD. If the deleted SYSMOD has not been previously accepted, its distribution zone SYSMOD entry contains only the DELBY information. Such a SYSMOD entry is called a "dummy entry". Although the deleted SYSMOD had not been previously accepted, SMP/E assumes it was a function SYSMOD, because only function SYSMODs can be explicitly deleted.