Build Approx CA

Key Build Approx CA in Yield Curve Ois refers to a choice from the list Build Approx
It refers to the index defined in ON Index

This setting applies only to those OIS contracts that reference a compounded average index.
The optional entry Build Approx AA applies to the contracts that reference an arithmetic average index.
It cannot be set to Takada
The recommended entry is Telescopic, which results to faster routines without numerical cost.
The entry None can be useful only when details about the implied daily overnight rates need to be part of the displayed cash flows.
Be aware though that the entry here will be ignored and all daily overnight rates will be considered if Lookback is TRUE.