These two columns were removed in version 3.11.0 when support for WooCommerce 2.2:
order_discount was removed as well.
These two columns remained after WooCommerce 2.3 was released for backwards compatibility and no longer apply as version 2.3 introduced changes to the coupon system – more details here: https://woocommerce.wordpress.com/2014/12/12/upcoming-coupon-changes-in-woocommerce-2-3/.
Since it’s no longer possible to have both order discounts and cart discount, the WooCommerce Customer/Order CSV Export extension now only has a
I suggest that you apply the required changes in any integrations using the CSV export to work with the current state of columns exported and replaces any uses of
order_discount with just