SAP GRC Access Control: Global Ruleset is gone!

Hi

I read somewhere that all BC sets related to rule set (t-code SCPR20), once activated will be automatically combined into the “Global” rule set, which seems to be the default rule set by SAP. For some reason, we don't have any rule set by that name (we have one with a different name).

1) what would happen if we activate a BC?"

2) how can we have Global rule set back?

Thanks

Reza Ahoui