Fusion Applications - Task - Manage Set Assignments for Set Determinant Type - What is the Purpose??

Summary

For a specific Reference Group Name what is the purpose of associating Determinant Value and Set Name ?

Content

While exploring the Reference Data Set aspects have looked at the task :  Manage Set Assignments for Set Determinant Type. This page seems to associate a specific Reference Group (ie. a Setup Object using RDS feature) Reference Data Sets. There are 2 columns for each row (for a specific Reference Group) ie. Determinant Value and Set Name - Both contain lookup values to Reference Data Set -  Not very clear as to why 2 columns with the same Reference Data Set LoV is provided ? What is the purpose ?