[Ed B.]

I would like to make discounts "manually" on individual order in my module, just as one can do in the admin page for order editing. I am aware that
a correct way would be to set up "surcharges/modifiers". However, a quick look at the
xcart table structure reveals that the table xc_order_items have columns
itemNetPrice and discountedSubtotal. So, I thought it would suffice to modify these columns (and of course, the total in xc_order). However, if I change manually the
content of the table

$item -> getItemNetPrice()

 

doesn't reflect the change I made. But

$item ->getDiscountedSubtotal()

gives the value in the table. Is there any way to implement this idea?
When one edits the orders in admin page, one simply modifies the column "price", but I would like to leave that column unchanged.