Error -270 when having extra condition in where clause

Hi, i=B4ve some really strange problems with the following prepared statement= =2E LET l_query =3D " select code, sum(t_flaeche.flaeche) from t_flur, t_flaeche wheret_flur.onr =3D ? and t_flur.nr_fmass =3D ? and #t_flur.land_kz =3D ? and t_flaeche.onr =3D t_flur.onr and t_flaeche.nr_fmass =3D t_flur.nr_fmass and t_flaeche.nr_flur =3D t_flur.lfdnr group by code order by code" PREPARE sc_code FROM l_query DECLARE q_code CURSOR FOR sc_code = When i use the statement in this form (the land_kz condition not active), i can open the cursor as much times i like and fetch data. If i activate the extra condition and open the cursor for the second time and make the first fetch, i got an error -270 (Cannot position within temporary file). = This doesn=B4t happen if i remove the SUM and GROUP BY parts of the statements. It also doesn=B4t happen i doesn=B4t prepare the statement. But why should the above doesn=B4t work with a prepared statement. Is it = a known bug? We=B4re running an Online 5.0x engine with 4.1 clients. Greetings, Joerg