INCOMPTD report is used to locate IFCID 376 events.
Not all events are written to the report.
Specifically, many jobs with steps that are using unload program DSNTIAUL with CHAR(dec) usages are not logged in the INCOMPTD report.
Release : 20.0
DB2 has logic to not write out IFCID 376 records over and over again, for the same exact application.
This the reason that not all DSNTIAUL records are reported.