$query = qq|UPDATE parts SET onhand = onhand - ? WHERE id = ?|;
@values = (conv_i($form->{"qty_$i"}), conv_i($form->{"id_$i"}));
do_query($form, $dbh, $query, @values);
$query = qq|UPDATE parts SET onhand = onhand - ? WHERE id = ?|;
@values = (conv_i($form->{"qty_$i"}), conv_i($form->{"id_$i"}));
do_query($form, $dbh, $query, @values);