Zero Bond Discounting Factors 
In Treasury and Risk Management, you can choose between two different interest rate functions. (You can only deploy one of the functions at a time.)
If you use the classic interest rate tables, we recommend that you read the section Zero Bond Discounting Factors.
If you use the Yield Curve Framework, we recommend that you read the sections Creation of Yield Curves and Calculate Interest Rates from the Yield Curve Generated.