Settle Days

Key Settle Days in
Bond refers to the number of business days between transaction date and settlement date w.r.t. a bond purchase.
Here the settlement date refers to the date when the dirty bond price is transfered from the buyer to the seller.
This setting has no effect on the bond npv calculated by QuantLib, since this is always wrt the valuation date.
It only affects extra results such as the clean/dirty price and the settlement value.