Created on 2018-03-15.12:13:45 by ced, last changed 30 months ago by ced.
All of them. Discount is the reduction of the base price , it can not be entered as a negative line. But maybe you are talking about rebate  which I think may be require negative price. So I would say, it is probably better to prevent to have twice negative value for quantity and price.  https://en.wikipedia.org/wiki/Discounts_and_allowances  https://en.wikipedia.org/wiki/Rebate_(marketing)
Which price are you talking about? I currently use this for discounts.
I do not think it makes sense to have negative price. Also what would it mean to have a sale line with quantity -1 and unit price -10?
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