Mandatory
This field contains the collection number assigned by the Receiver of the message, as it appears in field 20 of the MT 410 Acknowledgement.
This field must not start or end with a slash ('/') and must not contain two consecutive slashes ('//') (Error code(s): T26).
In cases where the initial message was not sent via SWIFT, and the reference cannot be contained in field 21, the code SEE72 may be used and the reference placed in field 72.
If the reference of the collecting bank is not known, the code NONREF must appear in this field. When this is the case, field 59 Drawee must be present.