cast problem 8.3.1 - Mailing list pgsql-general

Hello List,

I can't seem to figure out what is this code that worked on 7.4.x.
I've added cast to everything but still
get:

postgres error log:
ERROR:  operator does not exist: text = integer
HINT:  No operator matches the given name and argument type(s). You
might need to add explicit type casts.
STATEMENT:  update T_MON_DEVICE_STATUS set device_ip  =  $1  :: inet
  , status  =  $2  :: integer  , status_date  = now () ,
last_event_log_no  = case  $3  when 0 then null else  $4  :: integer
end  where unit_serial_no =  $5  :: text   and device_name =  $6  :: text

pgc code:
EXEC SQL UPDATE T_MON_DEVICE_STATUS
SET device_ip = :h_device_ip::inet,
        status = :h_status::integer,
   status_date = now(),
last_event_log_no =
       case :h_event_log_no when 0 then null
           else
            :h_event_log_no::integer end
  WHERE unit_serial_no = :h_unit_serial_no::text
       AND device_name = :h_device_name::text;

table:
\d t_mon_device_status
             Table "public.t_mon_device_status"
       Column       |           Type           | Modifiers
-------------------+--------------------------+-----------
  unit_serial_no    | character varying(15)    | not null
  device_name       | character varying(64)    | not null
  device_ip         | inet                     | not null
  status            | integer                  | not null
  status_date       | timestamp with time zone | not null
  last_event_log_no | integer                  |
Indexes:
     "pk_tmds_usn_dn" PRIMARY KEY, btree (unit_serial_no, device_name)
Foreign-key constraints:
     "fk_tmds_usn" FOREIGN KEY (unit_serial_no) REFERENCES
t_unit_status_log(unit_serial_no) ON DELETE CASCADE

maybe someone else can see where I am going wrong.

Thanks in advance,
Steve