 16x |
Mandatory in mandatory sequence A
This field specifies the reference assigned by the Sender to unambiguously identify the message.
This field must not start or end with a slash '/' and must not contain two consecutive slashes '//' (Error code(s): T26).
The reference must be unique for each message (or chain of messages) and is part of the message identification and transaction identification which is to be used in related queries, cancellations, etc.
