SQL & PL/SQL :: Trigger - Non-numeric Character Was Found Where Numeric Was Expected

I have an sqlldr process running loading data into my database. I have created a trigger to run before inserts on each row to start gathering summary data from the basic underlying data. The trigger compiles ok and the procedures the trigger is calling compile ok, but when the sqlldr process runs I get errors in the log files.

Here is the sqlldr control file:

LOAD data
APPEND INTO TABLE cdr.day_tables
FIELDS TERMINATED BY ','
TRAILING NULLCOLS
(
RecordCode
,CdrStart DATE 'YYYY DDD SSSSS'
[code].......,

Next is my trigger

create or replace TRIGGER BNUMBER_SUMMARY_INS
BEFORE INSERT ON DAY_TABLES
FOR EACH ROW
DECLARE
[code]......

Next are the procedures that are called by the trigger:

create or replace PROCEDURE BNUMBER_SUMMARY
( BNUMBER IN VARCHAR2
, CALLDATE IN DATE
, CALLDURATION IN NUMBER
) AS
record_found NUMBER;
BEGIN
[code].......

The error messages I am getting are:

Record 1: Rejected - Error on table CDR.DAY_TABLES, column CDREND.
ORA-01858: a non-numeric character was found where a numeric was expected
ORA-06512: at "CDR.BNUMBER_SUMMARY_INS", line 6
ORA-04088: error during execution of trigger 'CDR.BNUMBER_SUMMARY_INS'

I need to find out what field it is complaining about, especially since I am not even using the cdrend field from the input record?