Change the query 'Q_test' to the following:
SELECT AP.id_sort, USER.fname, AP.nr_ap, [nr_ap]*[price_div_tot_nr_ap] AS Fvalue
FROM ([USER] INNER JOIN (SORT INNER JOIN AP ON SORT.id_sort = AP.id_sort) ON USER.id_user = AP.id_user) INNER JOIN Q1 ON SORT.id_sort = Q1.id_sort
GROUP BY AP.id_sort, USER.fname, AP.nr_ap, [nr_ap]*[price_div_tot_nr_ap]
ORDER BY AP.id_sort;