The undiscounted amount did not take into account the taxes
included in the price. Included taxes were seen as a discount.
For a quotation with one line with an included tax of 15%,
but no discount, the undiscounted amount must be the line price subtotal,
the price subtotal already removing the taxes from the price unit.
For a quotation with one line with an included tax of 15%,
and a discount of 10%, the undiscounted amount must be the line price subtotal,
plus the amount discounted. That way, the taxes included are already removed
from the price, but the discount is not included.
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