 16x |
Conditional (see rule C2) in mandatory sequence A
This field contains the identification of the message to which the current message is related.
This field must not start or end with a slash '/' and must not contain two consecutive slashes '//' (Error code(s): T26).
When used, this field must contain the Sender's reference (field 20) of the previous confirmation which is to be amended, cancelled, closed out, or for which a lifecycle event (knock-in, knock-out, or trigger hit) is being reported by this message.
