| Tag | Field Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|
| 313 | UnderlyingMaturityMonthYear | MonthYear |
Underlying security’s MaturityMonthYear. Required if UnderlyingMaturityDay is specified. See MaturityMonthYear field for description | Added FIX.4.2 |
|