If a lookup key should be NOT NULL, then I don't understand why a
TIB_LookupCombo allows to press <DEL> for retrieving a NULL value.
Since this not Windows standard to work with a combo box, I don't find
it user friendly. So I am getting asked by my customers how to remove
a previously chosen selection from a lookup combo.

Ok, it seems that I am the only one with this suggestion...

Thanks for all replies.
Mario

--- In IBObjects@y..., Helen Borrie <helebor@d...> wrote:

> LookupID Description
>
> 0 '<None>'
> 1 'Cheese and chocolate'
> 2 'Escargots'
> 3 'Jalapeno and vanilla'
>
> For lookup keys you should define a default and/or NOT
NULL, just to ensure that a new row never gets stored with a NULL
there.