The field pain.006.001.01/OrgnlGrpInf/CxlRsnInf/CxlRsn/Cd  or pain.006.001.01/TxInf/CxlRsnInf/CxlRsn/Cd specifies the reason for the cancellation request.  According to ISO20022 message definition the field can contain one of the following values:

AGNT (Agent in the payment workflow is incorrect).
CURR (Currency of the payment is incorrect).
CUST (Cancellation requested by the Debtor).
DUPL (Payment is a duplicate of another payment).
SUSP (Payment is a suspicious payment).
UPAY (Payment is not justified).

In Nordea cancellation request the field is omitted. If used, however, it is recommended that the code being used is "CUST".