I am trying to obtain historical data for credit ratings for both corporate and sovereigns.
For corporate, I used many of the DataTypes available when searching for "S&P Ratings", but I always get NAN. Is this normal? (example:Rating - S&P Current Creditwatch (Bond)ISPCWRating - S&P Current Local Rating (Borrower)BSPLRating - S&P Current Outlook (Bond)ISPOLRating - S&P Current Rating With Outlook (Bond)ISPRTRating - S&P Historical Foreign Long Term Rating (Borrower)BSPOLRating - S&P Historical Local Rating (Borrower)BSPHLRating - S&P Historical Rating (Bond)ISPHRT
For sovereigns, I don't know what Instrument to use. For instance, for the United States credit Rating, what Instrument code should I use?