Krasimir,

Run following select from command window on big tables.

SELECT invoices.*,invdet.*,invdet.td as to1 ;
FROM invdet,invoices ;
WHERE invdet.invoiceid=invoices.invoiceid ;
INTO CURSOR test

The number of records should be the same as in the Invdet table.
If it is that something is wrong with

invoices.invoiceid=THISFORMSET.vlinvoiceid;

condition.
Otherwise you have inconcistency between the invdet and invoices tables.

<
>I remove !deleted() clause -: Don't work
>I rename ".. as TO;" clause to ".. as TO1;" -: Don't work
>I delete and recreate indexes -: Don't work
>
>I test this SELECT comand with two sets of tables : small , and bigger.
>With small /500,26000 recs/ it work, but with large /5000, 50000/ - not.
>--------------
>Krasimir Georgiev.