Hi Faisal
I take it to mean that the rule set SAP_R3_LG whilst the others are subsets of it.
But for me, I'll activate the entire SAP Sets (ie. exclude non-SAP components) and then export them to Excel to Review and maintain as required.
If you have multiple components in your landscape and separate HR to finance you might want to activate a only a subset of the total rules as the Finance Actions may not apply in HR component and vice versa.
You can always extract the data from the BC sets and compare (unless someone from SAP jumps in here).
Regards
Colleen