'$form->{"unit_$i"}', $deliverydate, (SELECT id FROM project WHERE projectnumber = '$project_id'),
'$form->{"serialnumber_$i"}')|;
$dbh->do($query) || $form->dberror($query);
'$form->{"unit_$i"}', $deliverydate, (SELECT id FROM project WHERE projectnumber = '$project_id'),
'$form->{"serialnumber_$i"}')|;
$dbh->do($query) || $form->dberror($query);