next unless ($form->{"id_$i"});
my $base_unit_factor = $units->{ $part_info_map{$form->{"id_$i"}}->{unit} }->{factor} || 1;
my $qty = $form->parse_amount(\%myconfig, $form->{"qty_$i"}) * $units->{$form->{"unit_$i"}}->{factor} / $base_unit_factor;
next unless ($form->{"id_$i"});
my $base_unit_factor = $units->{ $part_info_map{$form->{"id_$i"}}->{unit} }->{factor} || 1;
my $qty = $form->parse_amount(\%myconfig, $form->{"qty_$i"}) * $units->{$form->{"unit_$i"}}->{factor} / $base_unit_factor;