Next Cpn Rate

Function Next Cpn Rate within Bond with keys Bond Next Cpn Rate keysreturns the coupon rate of the accrual period of the referenced bond following the given reference date Tˢ
Several values may be also returned here in the form of a 1D-array

If the settlement date Tˢ is not explicitly given, it will be set to the bond's settlement date as implied by a trade transaction assumed to occur on the trade dateT₀ (typically today).