>> I use primary keys, no duplicates; problem is not duplicate the primary key
>> but phisicaly get appended record from different station on same recno
>> position instead one after another; please see thread #606423
>
>Maybe you must manually lock the table before issued table update, or using pesimistic buffering mode...
>

Pesimistic is not taken in account because I have ~300 invoices to do in 3hours and this type of buffering realy slows down working.
I will try locking manualy and see what's happen.