| Tag | Field Name | Abbr Name | Data Type | Union Datatype | Description | Pedigree |
|---|---|---|---|---|---|---|
| 313 | UnderlyingMaturityMonthYear | MMY | MonthYear | Underlying security's MaturityMonthYear. Can be used with standardized derivatives vs. the UnderlyingMaturityDate (542) field. | Added FIX.4.2 |
|