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Created on 2018-03-15.12:13:45 by ced, last changed 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.
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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