Alexandre,

ABS> By the way... I don't like to show a message based on text (like you did)
ABS> but the exception number changes on each "drop/create exception" so there
ABS> is no other way... I think will be realy good if FB could store an "error
ABS> number" in the user exception and in FK violations, this error should be
ABS> constant to be incorporated in the client app...

Here's what I usually do

create exception some_exception '[1234] Somethig terrible happened';

and then extract the bracketed error code client side and show a
cleare message depending on context.

Clients that don't do this will see the error messages with the []
stuff included, but that's no big deal for me.

Ciao
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