My order shows a $10 shipping discount, but when I got my stuff last week, the invoice didn't reflect the $10 discount. Hows come?
M@
You're right, the packing slip didn't show the discount. However, the discount was indeed applied. I'll fix that display issue for future packing slips.
Cool. Thanks.
M@
Senior Software Developer
|
Hmm. After some coffee and a few minutes' thought, now I know why we don't show the discount on the packing slip. Turns out it's hard to do properly. :-)
A package can contain items from multiple orders, and it can also contain only a portion of an order. We can't just show the discount applied to the order, we need to show the total of the portion of the order discount that's applicable to each line item, from each order. This leads to subtle rounding issues that drive me nuts (e.g., we may end up showing $9.99 or $10.01 for a $10.00 discount if there were an odd number of items in the package).
Anyway. It's now on my to-do list.