| 16x |
This field contains the content of field 20 Transaction Reference Number of the SWIFT message for which cancellation is requested.
This field must not start or end with a slash '/' and must not contain two consecutive slashes '//' .
Where all the transactions in a multiple message are requested for cancellation, this field must contain the content of field 20 in the non-repetitive sequence. If there is no field 20 in the non-repetitive sequence, the content of field 20, or if not present, that of field 21 associated with the first transaction contained in the message must be used.