field names for new in trigger function

Have a table

CREATE TABLE transaction

(

  "sourceDate" timestamp with time zone,

  "sourceName" character varying(300),

  uid_commission integer,

  attempts integer

)

Have another table

CREATE TABLE freshness

(

  uid_commission integer,

  "sourceDate" timestamp with time zone

);

Have a trigger

CREATE TRIGGER update_freshness

  AFTER INSERT OR UPDATE

  ON transaction

  FOR EACH ROW

  EXECUTE PROCEDURE update_freshness();

Finally have procedure

CREATE OR REPLACE FUNCTION update_freshness()

  RETURNS trigger AS $ $

DECLARE

  latest timestamp with time zone;

BEGIN

  SELECT sourceDate INTO latest FROM freshness WHERE uid_commission = NEW.uid_commission;

  IF FOUND THEN

    IF NEW.sourceDate > latest THEN

       UPDATE freshness SET sourceDate = NEW.sourceDate WHERE uid_commission = NEW.uid_commission;

    END IF;

  ELSE

    INSERT INTO freshness (uid_commission, sourceDate) VALUES (NEW.uid_commission, NEW.sourceDate);

  END IF;

  RETURN NULL;

END;  $$ LANGUAGE 'plpgsql';

The trouble is the column names.  NEW.sourceDate pukes.  Error says, 'column "sourcedate" does not exist';

Can't change the column names now.  What is correct syntax to get the "sourceDate" field of the NEW object?

Any insight appreciated.

New_To_Sql_Guy