Thanks for the help. There was a piece of code for OnChange event of
one of DBEdit components and I don't know why but it triggers this
event everytime it scrolls in the db.

Can

--- In firebird-support@yahoogroups.com, "Bisey" <biseydegil@y...> wrote:
>
> > Just some shots in the dark:
> >
> > 1. Since exeption class is EIB... I supose you are using IBX.
> > Is it "pure" IBX or there is some kind of "wraper" over it?
>
> It is pure IBX. I am using InterBase components which come with Delphi
> itself.
>
> > 2. Which are the event handlers attached to that dataset?
>
> There is really no event handler for this table.
>
> > 3. Are you using any calculated fields?
>
> No.
>
> > 4. Are you aware a calculated field can only be assigned inside
> > a OnCalcFields event handler?
> > 5. What is the value for State property on that dataset when
> > the error fires?
>
> It is dsBrowse. When I click on another record in the grid. I also get
> same error.
>
> Thanks,
> Can
>
>
> > Ivan.