Field UnderlyingPaymentStreamInitialRate (40634) - FIX Protocol FIX.5.0SP2 EP240
The initial floating rate reset agreed between the principal parties involved in the trade. This is assumed to be the first required reset rate for the first regular calculation period. It should only be included when the rate is not equal to the rate published on the source implied by the floating rate index. An initial rate of 5% would be represented as 0.05.
Added in protocol FIX.5.0SP2 (161)