BNZ has been handed a warning under anti-money-laundering rules for failing to report the right locations for 50,000 cash transactions.
The Reserve Bank today said the formal warning was for domestic transactions in prescribed transaction reports between November 2018 and April 2020.
BNZ identified a technical coding error, which led to it providing the wrong location information.
The information was given to the Police Financial Intelligence Unit (FIU).
"Upon being alerted to the error in its reporting, BNZ promptly remediated the matter, and has fully cooperated with the Reserve Bank during the investigation," the central bank said.