On page 8 of the latest Pathfinder Society Guide to Organized Play (8/11/2014) the "Pathfinder Companion: Blood of FIENDS" states that "To create an aasimar, you must have a Chronicle sheet that opens the race as a legal option at character creation". I assume that this meant to say "To create a TIEFLING, you must have a Chronicle sheet that opens the race as a legal option at character creation". The entry for the Blood of Angels (also on page 8) appears to be correct.