OptionalFields
AdvertisementMessage AllocationACKMessage AllocationMessage AllocsGroup DontKnowTradeMessage EmailMessage ExecsGroup ExecutionReportMessage HeartbeatMessage IOIQualifiersGroup IndicationofInterestMessage LinesOfTextGroup ListCancelRequestMessage ListExecuteMessage ListStatusMessage ListStatusRequestMessage LogonMessage LogoutMessage MiscFeesGroup NewOrderListMessage NewOrderSingleMessage NewsMessage OrderCancelRejectMessage OrderCancelReplaceRequestMessage OrderCancelRequestMessage OrderStatusRequestMessage OrdersGroup QuoteMessage QuoteRequestMessage RejectMessage RelatedSymGroup ResendRequestMessage SequenceResetMessage SettlementInstructionsMessage TestRequestMessage