 16x |
Mandatory in mandatory sequence A
This field contains the identification of the confirmation to which the current message is related, that is, field 20 Transaction Reference Number of the previous confirmation to be amended, cancelled or closed out by this message.
This field must not start or end with a slash '/' and must not contain two consecutive slashes '//' (Error code(s): T26).
In a new contract, this field must contain the code NEW.
In all other cases, this field must contain the TRN of the previous MT 305.
The content of field 21, when other than NEW, will normally be a reference meaningful to the Sender rather than the Receiver. This is the case because the Sender will normally include the content of field 20 from the MT 305 previously transmitted rather than received.
