Record rejected using SQL*Loader

Question

I'm not too sure why I'm getting the following error message:
Record 1: Rejected - Error on table LOAD_DATA, column CLIENT_NUMBER.
ORA-01401: inserted value too large for column
Here is my info:
Table def:
SQL> describe load_data
Name Null? Type
CLIENT_NUMBER NOT NULL VARCHAR2(4)
PROD_SER VARCHAR2(5)
FEE_TYPE VARCHAR2(5)
QUANTITY NUMBER(13,5)
ALLOC_CODE VARCHAR2(11)
PROCESS_DATE DATE
My control file def:
LOAD DATA
INFILE "DATA.DAT"
APPEND
INTO TABLE <schema>.LOAD_DATA
FIELDS TERMINATED BY ','
TRAILING NULLCOLS
(CLIENT_NUMBER CHAR,
PROD_SER CHAR,
FEE_TYPE CHAR,
QUANTITY "TO_NUMBER(:QUANTITY,'99999999.99999')",
ALLOC_CODE CHAR,
PROCESS_DATE "TO_DATE(:PROCESS_DATE, 'MMDDYYYY')")
Sample Data:
A348,04201,PR200,88,,01182007
A348,04201,PR200,9,,01192007
A348,04201,PR200,93,,01192007
Erorr Message:
Table LOAD_DATA, loaded from every logical record.
Insert option in effect for this table: APPEND
TRAILING NULLCOLS option in effect
Column Name Position Len Term Encl Datatype
CLIENT_NUMBER FIRST * , CHARACTER
PROD_SER NEXT * , CHARACTER
FEE_TYPE NEXT * , CHARACTER
QUANTITY NEXT * , CHARACTER
SQL string for column : "TO_NUMBER(:QUANTITY,'99999999.99999')"
ALLOC_CODE NEXT * , CHARACTER
PROCESS_DATE NEXT * , CHARACTER
SQL string for column : "TO_DATE(:PROCESS_DATE, 'MMDDYYYY')"
Record 1: Rejected - Error on table LOAD_DATA, column CLIENT_NUMBER.
ORA-01401: inserted value too large for column

Answer 1

Your exact data and control file worked for me...
Table LOAD_DATA:
  3 Rows successfully loaded.
  0 Rows not loaded due to data errors.
  0 Rows not loaded because all WHEN clauses were failed.
  0 Rows not loaded because all fields were null.
SQL> select * from load_data;
CLIE PROD_ FEE_T             QUANTITY ALLOC_CODE  PROCESS_DAT
A348 04201 PR200                   88             18-JAN-2007
A348 04201 PR200                    9             19-JAN-2007
A348 04201 PR200                   93             19-JAN-2007