sqlldr generating ORA-00984: column not allowed here - while trying to add constant text - sql-loader

Question

I need to load several similar csv files into work tables with the same format for onward processing but for some of the data I get 'ORA-00984: column not allowed here' errors.
I can't change the layout of the csv but the ordering of the columns in the work table and the format of the sqlldr control file are in my control.
What do I need to change to get sqlldr to load this data?
EDIT: Solution: The following change to the .ctl file:
col6_fixedchar constant "abc", fixes the issue, interestingly sqlldr is quite happy with interpreting "3600" as a number.
Below is a sample:
table:
create table test_sqlldr
(
col1_date date,
col2_char varchar2(15),
col3_int number(5),
col4_int number(5),
col5_int number(5),
-- fixed and dummy fields
col6_fixedchar varchar2(15),
col7_nullchar varchar2(20),
col8_fixedint number(5)
);
csv:
cat /tmp/test_sqlldr.csv
2019-08-27 09:00:00,abcdefghi,3600,0,0
2019-08-27 09:00:00,jklmnopqr,3600,0,0
2019-08-27 09:00:00,stuvwxyza,3600,3598,3598
2019-08-27 09:00:00,bcdefghij,3600,0,0
ctl:
cat /tmp/test_sqlldr.ctl
load data infile '/tmp/test_sqlldr.csv'
insert into table test_sqlldr
fields terminated by ',' optionally enclosed by '"' TRAILING NULLCOLS
(
col1_date timestamp 'yyyy-mm-dd hh24:mi:ss',
col2_char,
col3_int,
col4_int,
col5_int,
col6_fixedchar "abc",
col8_fixedint "3600"
)
This generates the following output:
/opt/oracle/product/112020_cl_64/cl/bin/sqlldr <db credentials> control='/tmp/test_sqlldr.ctl' ; cat test_sqlldr.log
SQL*Loader: Release 12.2.0.1.0 - Production on Wed Aug 28 10:26:00 2019
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
Path used: Conventional
Commit point reached - logical record count 4
Table TEST_SQLLDR:
0 Rows successfully loaded.
Check the log file:
test_sqlldr.log
for more information about the load.
SQL*Loader: Release 12.2.0.1.0 - Production on Wed Aug 28 10:26:00 2019
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
Control File: /tmp/test_sqlldr.ctl
Data File: /tmp/test_sqlldr.csv
Bad File: /tmp/test_sqlldr.bad
Discard File: none specified
(Allow all discards)
Number to load: ALL
Number to skip: 0
Errors allowed: 50
Bind array: 64 rows, maximum of 256000 bytes
Continuation: none specified
Path used: Conventional
Table TEST_SQLLDR, loaded from every logical record.
Insert option in effect for this table: INSERT
TRAILING NULLCOLS option in effect
Column Name Position Len Term Encl Datatype
------------------------------ ---------- ----- ---- ---- ---------------------
COL1_DATE FIRST * , O(") DATETIME yyyy-mm-dd hh24:mi:ss
COL2_CHAR NEXT * , O(") CHARACTER
COL3_INT NEXT * , O(") CHARACTER
COL4_INT NEXT * , O(") CHARACTER
COL5_INT NEXT * , O(") CHARACTER
COL6_FIXEDCHAR NEXT * , O(") CHARACTER
SQL string for column : "abc"
COL8_FIXEDINT NEXT * , O(") CHARACTER
SQL string for column : "3600"
Record 1: Rejected - Error on table TEST_SQLLDR, column COL4_INT.
ORA-00984: column not allowed here
Record 2: Rejected - Error on table TEST_SQLLDR, column COL4_INT.
ORA-00984: column not allowed here
Record 3: Rejected - Error on table TEST_SQLLDR, column COL4_INT.
ORA-00984: column not allowed here
Record 4: Rejected - Error on table TEST_SQLLDR, column COL4_INT.
ORA-00984: column not allowed here
Table TEST_SQLLDR:
0 Rows successfully loaded.
4 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.
Space allocated for bind array: 115584 bytes(64 rows)
Read buffer bytes: 1048576
Total logical records skipped: 0
Total logical records read: 4
Total logical records rejected: 4
Total logical records discarded: 0
Run began on Wed Aug 28 10:26:00 2019
Run ended on Wed Aug 28 10:26:00 2019
Elapsed time was: 00:00:00.14
CPU time was: 00:00:00.03

Answer 1

Try: col6_fixedchar CONSTANT "abc"