Tried to follow the following link:
Keyname Unique Primary Field Action
Group_pkey Yes Yes GroupID
<http://mailtest.nextlevel.com/phpPgAdmin/sql.php?server=1&db=ollyollyoxenfr
ee&table=Group&goto=tbl_properties.php&sql_query=DROP+INDEX+%22Group_pkey%22
&zero_rows=> Drop
[ <http://www.postgresql.org/docs/user/keys.htm> Documentation]
But it's not to be found.
Thx,
Pablo Gosse