This feature was removed in ODBC Driver for Teradata 16.00.
ODBC Driver for Teradata support for ODBC scalar functions outside escape sequences has been deprecated. This is a Teradata-specific extension to the ODBC standard and its use was removed in 16.00.
ODBC scalar functions should always be used within escape sequences. For example:
SELECT {fn DAYOFWEEK(delivery_date)} FROM order_table;