You can then open the new tables in this form but don't include the already opened tables in the DE. You should still be able to set your InitialSelectedAlias the the table you want which the other form opens but if not, do a "SELECT" in the load of the form.
>Well the main problem of this solution is that I have some other tables opened in child form's DataEnvironment wich not exist in parent form. So if I set AutoOpenTables and AutoCloseTables to .f. in child form I should open it in parent form instead. I think i'll do this way (though I don't want to do that :-)). I just still can't find the other way to solve it