Intercepting DBmessages

[Odysseus]

What would be the best place to put a getLastDatabaseMessage handler when I want to prevent the standard alert window from popping up ?

I added a check constraint to a table definition which is working fine. (It pops up in servoy complaining a record is not unique) However for my endusers the message is far to complicated, so I want to intercept it and replace it with my own dialog box (and do a rollback after)

THX