E1 9.2 - UBE Data Selection not serialized during eGeneration?

We have an UBE R04570 with 1500+ versions, each one with their Data Selection configuration. Using generation on demand, each time that a new version is selected to submit and data selection is checked, it takes 3 minutes or more to show the data selection screen.

As workaround, I run manual serialization for one version (btw it takes similar time too) and verified that new records are inserted in the F989998 & F989999 tables, but when I will test again in the html, It takes 2 or 3 minutes, and I realized that with generation on demand, it insert more records in the serialization tables, so I asume that Data Selection records are not being generation with manual serialization.