Referencial integerity problem

Briefly, I create two tables, one having a column which references the
other and which implements cascade deletes and updates.  I create a user
who has modify access on one table, but only select on the referenced
table.  This user is not allowed to insert a record into the referencing
table - the error message refers to the referenced table.

I don't think referential integrity should work this way.  Any thoughts?

Details:

create table foo (
  foo char(10)
);
revoke all on foo from public on foo;

create table bar (
  foo char(10) references foo (foo) on delete cascade on update cascade,
  parm int
);
revoke all on bar from public on bar;

create user lim ;

grant select on foo to lim;

grant insert on bar to lim;
grant update on bar to lim;
grant delete on bar to lim;
grant select on bar to lim;

 bash$ psql -U lim test
Password:
Welcome to psql, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help on internal slash commands
       \g or terminate with semicolon to execute query
       \q to quit

test=> select * from foo ;
    foo
------------
 foo
 bar
(2 rows)

test=> insert into bar values ('foo', 1);
ERROR:  foo: Permission denied.
test=>

--
Mike Howard <mike@clove.com>