SQL Loader loads duplicate records even when there is PK defined

Hi,
I have created table with pk on one of the column.Loaded the table using sql loader.the flat file has duplicate record.It loaded all the records without any error but now the index became unusable.
The requirement is to fail the process if there are any duplicate.Please help me in understaing why this is happening.
Below is the ctl file
OPTIONS(DIRECT=TRUE, ERRORS=0)
UNRECOVERABLE
load data
infile 'test.txt'
into table abcdedfg
replace
fields terminated by ',' optionally enclosed by '"'
col1 ,
col2
i defined pk on col1

Check out..
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14215/ldr_modes.htm#sthref1457
It states...
During a direct path load, some integrity constraints are automatically disabled. Others are not. For a description of the constraints, see the information about maintaining data integrity in the Oracle Database Application Developer's Guide - Fundamentals.
Enabled Constraints
The constraints that remain in force are:
NOT NULL
UNIQUE
PRIMARY KEY (unique-constraints on not-null columns)Since OP has the primary key in place before starting the DIRECT path load, this is contradictory to what the documentation says or probably a bug?

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