CA Datacom Version 14.0 provided a new keyword SORTDFLT for the LOAD and RETIX functions.
Add SORTDFLT=YES to be is used along with the SORT=value.
When used, DBUTLTY LOAD and RETIX look at the record counts in the CXX (or LOAD BACKUP record count input) to override the SORT value with an expected more accurate SORT value.
SORTDFLT was introduced with CA Datacom Version 14.0.
In the CA Datacom Core - 15.1 ,search for "SORTDFLT" to see sections for usage in "Rebuilding an Index Area" and "LOAD (Build a Data Area)" .