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My question is: why this behaviour is not automatically done by the system simply setting the the flag "Apply discount before tax"?
Thank you

[before]

In my question I was unclear. I retry to explain my doubt.
Regarding the first example, if the discount was applied before tax, the taxation should be computed in the following manner:

subtotal = 50.00
discount = -6.00 (12% of 50.00)
shipping = 5.00

total before tax = 49.00 (50 - 6 + 5)
TAX (20%) = 9,80

TOTAL = 58,80

Konakart does the following computation:

subtotal = 50.00
shipping = 5.00

total before tax = 55.00 (50 + 5)
TAX (20%) = 11,00
discount = 6 (12% of 50)

TOTAL = 60,00 (55 + 11 - 6)

In my opinion there is an error in the tax computation because the discount is not considered.
Can you explain me why Konakart compute the tax not applying the discount to the computation even if I set the flag "Apply discount before tax"?
Thank you for your patience.

We are using Konakart 4.1. If I enable a promotion to get a 12% discount with the flag "Apply discount before tax" set to true, this is the result (using simple example values):


subtotal        50.00
shipping         5.00
TAX (20%)       11.00 (computed on 50.00 + 5.00!)
12% discount     6.00
TOTAL           60.00


But if the discount has to be applied before tax (computation) I should get:


subtotal        50.00
shipping         5.00
TAX (20%)        9.80 (computed on 50.00 - 6.00 + 5.00)
10% discount     6.00
TOTAL           58.80[/font]
[/font]

Can you give some support? Is it a bug in the total order module or I'm wrong about the meaning of "discount applied before tax" expression?
Thank you very much