Field UnderlyingComplexEventStartDate (2054) - FIX Protocol FIX.5.0SP2 EP240
The start date of the date range on which a complex event is effective. The start date will be set equal to the end date for single day events such as Bermuda options. The start date must always be less than or equal to end date.
Added in protocol FIX.5.0SP2 (161)