Sub-Participants who do not use STP will not receive sub-item of BO5 related to STP.
Thus, for Sub-Participants who do not use STP will not receive [change_reason_c] (Change Reason Code): 43.
For example:
Sub-item of BO5 for order cancellation which does not canceled by STP.
34901+34005+34904+34902
[change_reason_c] (Change Reason Code) : "1"
Sub-item of BO5 for order cancellation due to STP.
34901 + 34005 + 34904 + 34902
[change_reason_c](Change Reason Code) : "43"