Appendix D: Order State Change Matrices – FIX 4.2 – FIX Dictionary

The Table below shows which state transitions have been illustrated by the matrices in this Appendix (marked with an asterisk). The row represents the current value of OrdStatus and the column represents the next value as reported back to the buy-side via an execution report or order cancel reject message. Next to each OrdStatus value is its precedence – this is used when the order exists in a number of states simultaneously to determine the value that should be reported back. Note that absence of a scenario should not necessarily be interpreted as meaning that the state transition is not allowed:

How to read the Order State Change Matrices:

• The "Execution Report" message is referred to simply as "Execution"
• The "Order Cancel/Replace Request" and "Order Cancel Request" messages are referred to as "Replace Request" and "Cancel Request" respectively
• The shaded rows represent messages sent from buy-side to the sell-side
• In general where two lines of a matrix share the same time, this means either
  • that there are two possible paths (e.g. a request is accepted or rejected) — in this case the first row of the two possible paths is the reject case which is italicized. The non-italicized row is the path that is continued by the remainder of the matrix
  • that two messages are being sent at the same time but in different directions such that the messages cross on the connection (e.g. a cancel request is sent at the same time as the sell-side is sending an execution) — in this case both lines have bold text
• For scenarios involving cancel requests or cancel/replace requests "X" refers to the original order, "Y" refers to the cancel/replacing order. A similar convention is used for corrections or cancels to executions