Hi Martijn,

>This constraint will end up as a table-constraint. Use any GUI tool >and you
>should be able to change/drop it - have a look at Firebird Workbench >or InterBase Workbench - www.upscene.com

Is there a way of alter it thru sql commands like a domain ? I would like do send a script to the client's computer, not to go there by myself...

Helton