Variable rate information is source specific, so you can store rates for multiple sources. The source on the security has to match the variable rate source on the entity in order for the system to use it in fixed income processing. For OID (original issue discount) eligible bonds that have a floating, variable rate, step coupon, or an unscheduled variable rate coupon type, the system requires a coupon rate as of the issue date to calculate an adjusted issue price.
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For more information, see Understand Original Issue Discount (OID).