"generated by default" question

[hilz]

Hi all.
If i have a table A defined as follows:

create table A
(
ID     INTEGER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
NAME   VARCHAR(255)
);
then i do the following:

    insert into A (ID, NAME) values (1,'hello 1');

and then i do the following:

    insert into A (NAME) values ('hello 2');

I will get this error:

The statement was aborted because it would have caused a duplicate key 
value in a unique or primary key constraint or unique index identified 
by 'SQL060529010004440' defined on 'A'.

To avoid this, I will have to do :

    alter table....RESTART WITH....

Is there another way to make the autoincrement smart enough to know that 
the value already exists and just generate a new value for me?
I find it odd to have to set the "restart with" to skip the values that 
i set manually.

thanks for any help.