Hi Abhijeet,
In the General Settings, we activate Legal Regulation at Country/Country Group Level. Later on, we activate Legal Regulation for individual services like Embargo, SPL etc. You can only activate Legal Regulations for individual services at Country/Country Group level which you have activated in first step (under general settings).
So first activate Legal Regulation for Country/Country Group Level and then activate SPL check for that Legal Regulation for import/export (for the Country/Country Groups defined in first step).
regards,
Kul Vaibhav