Server Utilities :: SQL Loader And Control File

I'm having a problem with SQL loader and the control file. I want to load a delimited file. The script will eventually be automated where the file name is passed in to the script, it's not a static name.

It's a simple SQL loader Unix script that I have created as follows

Unix file called test_load

# Auto Load
#
#
export data_file=/dev/test_$1$2.csv;
export ORACLE_HOME=/u01/oracle/product/10.2.0;
export ORACLE_SID=XXX;
export PATH=$PATH:$ORACLE_HOME/bin;

sqlldr userid=XXX/XXX data=$data_file
control=/dev/cntrl/test.ctl
errors=99999
bad=/dev/bad/test_$1$2_$$.bad
log=/dev/logs/test_$1$2_$$.log

the top of my control file is as follows

load data
truncate
into table test
fields terminated by "|"
when record_type = 'AA'
(

running at the prompt ./test_load myload 20100319

The following error occurs

SQL*Loader-350: Syntax error at line 5.
Expecting "(", found keyword when.
when record_type = 'AA'
^

I believe the format of my control file is correct but for some reason it won't load.