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The effective date for changes to a security's underlying index or index offset starts on the reset date. The effective date for changes to the day count basis, coupon, coupon type, or payment frequency starts on the coupon date. If a security has multiple changes to its index and index offset that share the same coupon period, the earning's process treats each earnings time period as a quasi coupon period. The system adds each of the quasi accrual periods together to create the coupon for the entire coupon period.