Helen,

> >Thanks a lot. The field ADOSEN.SUMME is a "computed-by" field. After
> >turning it into a normal numeric field everything's working fine. Is
> >this a bug?
>
> Not a bug - in InterBase you can't GROUP BY an expression for logical reasons

whatever the reason, the server lets me do something that is likely to
break it, so it *is* a bug. ;-)
Someone able to reproduce a simple test case should log it. I haven't
been able to do it.
Ciao
--
____
_/\/ando