Field SecondaryDisplayQty (1082) - FIX Protocol FIX.5.0SP2
Used for reserve orders when DisplayQty applies to the primary execution market (e.g.an ECN) and another quantity is to be shown at other markets (e.g. the exchange). On orders specifies the qty to be displayed, on execution reports the currently displayed quantity.
Added in protocol FIX.4.4 (22)