How can I get S&P500 index constituents every month since 2012-01-01? I am using excel sheet to download the data. I have tried using the function =@RDP .Data(".SPX","TR.IndexConstituentRIC","SDate=2012-01-01 CH=Fd RH=IN",B1) to get the ConstituentRIC, but it returned NULL. May I know why and how to solve this problem? Thank you!