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→ Underlying Product Code Source | Src | String | Identifies the source responsible for assigning the security identifier of the underlying security. This may be the exchange, CCP, or an international organization. | OPT | ALL | Both | H - Clearing House / Clearing Organization
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→ Underlying Security Type | SecTyp | String | Used to indicate the type of underlying security being reported; Future, Option on Physical, Option on Future, or Multi-leg for spreads. | OPT | ALL | Both | FUT - Future
FWD - Forward
MLEG - Multi Leg (Combo)
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→ Underlying Maturity | MMY | MonthYear | The expiration period code of an underlying instrument. Used in combination with UnderlyingSymbol or UnderlyingSecurityID to specify the instrument identifier. The value can be expressed as YYYYMM, YYYYMMDD or YYYYMMwN where w represents a reference to week. | OPT | ALL | Both |