next unless ($form->{"new_unit_$i"} && $form->{"old_unit_$i"});
@values = ($form->{"new_unit_$i"}, lc($form->{"old_unit_$i"}));
$sth->execute(@values) ||
next unless ($form->{"new_unit_$i"} && $form->{"old_unit_$i"});
@values = ($form->{"new_unit_$i"}, lc($form->{"old_unit_$i"}));
$sth->execute(@values) ||