"on commit preserve rows" not working

Database

"on commit preserve rows" not working

I am working in teradata 7.2.0 on Windows XP

Even if I created a volatile table as

"on commit preserve rows;".

it is showing as

"ON COMMIT DELETE ROWS;"

eg:
When I executed the query below

create volatile table vol_check1
(
col1 integer,
col2 integer,
col3 integer
)
On Commit Preserve Rows;

it is showing the structure as below

CREATE SET VOLATILE TABLE DB.vol_check1 ,NO FALLBACK ,
CHECKSUM = DEFAULT,
LOG
(
col1 INTEGER,
col2 INTEGER,
col3 INTEGER)
PRIMARY INDEX ( col1 )
ON COMMIT DELETE ROWS;

Can anyone help in this regard