> OK, now, this will be OK as long as you don't *next* change the ordering,
> since the query is at this point prepared.
>
> However...
> as soon as you change the ordering, the dataset is unprepared; so the

next

> thing to try is to add the assignment to the OnPrepareSQL event
> handler. Are you with me so far...?

Not a problem so far, but....
When I put the same assignment into the OnPrepareSQL event and start the
applicaiton I get an error message "Fieldname: Datum not found".

Florian