Time Message Received (ClOrdID, OrigClOrdID) Message Sent (ClOrdID, OrigClOrdID) Exec Type OrdStatus Order Qty Cum Qty Leaves Qty Last Qty Comment
1 New Order(X) 10000
2 Execution(X) New New 10000 0 10000 0
3 Execution(X) Trade Partially Filled 10000 1000 9000 1000 Execution for 1000
4 Replace Request(Y,X) 8000 Request decrease in order quantity to 8000, leaving 7000 open
5 Replace Request(Z,Y) 7000 Request decrease in order quantity to 7000, leaving 6000 open. Note OrigClOrdID set to last non rejected ClOrdID i.e. Y (on an "optimistic" basis)
6 Execution (Y,X) Pending Replace Pending Replace 10000 1000 9000 0 Broker processes Replace (Y,X) first
7 Execution (Y,X) Replace Partially Filled 8000 1000 7000 0 Broker processes Replace (Y,X) first
8 Execution (Z,Y) Pending Replace Pending Replace 8000 1000 7000 0 Broker then processes Replace (Z,Y). Note OrigClOrdID set to last accepted ClOrdID i.e. Y
9 Execution (Z,Y) Replace Partially Filled 7000 1000 6000 0 Broker then processes Replace (Z,Y)
10 Execution(Z) Trade Filled 7000 7000 0 6000 Execution for 6000