Order Cancel Request StandardHeader Standard Header Y MsgType = F 41 OrigClOrdID OrigClOrdID Y ClOrdID of the previous order (NOT the initial order of the day) when canceling or replacing an order. 37 OrderID OrderID N Unique identifier of most recent order as assigned by broker. 11 ClOrdID ClOrdID Y Unique ID of cancel request as assigned by the institution. 66 ListID ListID N Required for List Orders 109 ClientID ClientID N Used for firm identification in third-party transactions. 76 ExecBroker ExecBroker N Used for firm identification in third-party transactions. 55 Symbol Symbol Y 65 SymbolSfx SymbolSfx N 48 SecurityID SecurityID N 22 IDSource IDSource N 167 SecurityType SecurityType N Must be specified if a Future or Option. If a Future: Symbol, SecurityType, and MaturityMonthYear are required. If an Option: Symbol, SecurityType, MaturityMonthYear, PutOrCall, and StrikePrice are required. 200 MaturityMonthYear MaturityMonthYear N For Options or Futures to specify the month and year of maturity. 205 MaturityDay MaturityDay N For Options or Futures and can be used in conjunction with MaturityMonthYear to specify a particular maturity date. 201 PutOrCall PutOrCall N For Options. 202 StrikePrice StrikePrice N For Options. 206 OptAttribute OptAttribute N For Options. 207 SecurityExchange SecurityExchange N Can be used to identify the security. 106 Issuer Issuer N 107 SecurityDesc SecurityDesc N 54 Side Side Y 38 OrderQty OrderQty N Either CashOrderQty or OrderQty is required. OrderQty = CumQty + LeavesQty (see exceptions above) 152 CashOrderQty CashOrderQty N Either CashOrderQty or OrderQty is required. Specifies the approximate "dollar quantity" for the order. Broker is responsible for converting and calculating OrderQty in shares for subsequent messages. 58 Text Text N StandardTrailer Standard Trailer Y