Level span is there in Report Net 1.1 and Group span is there from in 8.x. Both will work same if you want to repeat a grouped item with respect to change the nested data item under it. But, rather th...
As far as I know, level span was in Cognos 1.1 and Cognos 8 had Group Span. I thought they had the same functionality, and it was just renamed for whatever reason. Please correct me if i am wrong!