Don't Know Trade StandardHeader Standard Header Y MsgType = Q 37 OrderID OrderID N Broker Order Id as identified on problem execution 17 ExecID ExecID N Execution Id of problem execution 127 DKReason DKReason Y 55 Symbol Symbol Y 54 Side Side Y 38 OrderQty OrderQty Y 32 LastShares LastShares Y 31 LastPx LastPx Y 58 Text Text N StandardTrailer Standard Trailer Y