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[Tiahh]

I installed the contribution discount coupon version 3.3 and I have looked in all the forum but I found nothing. My problem now is that the subtotal does not take the coupon. I changed the order of the sort like this but it makes no difference:
Discount Coupon 0
expedition 2
Sub-Total 1
VAT 3
total 4

I reinstalled the module several times and fix bug with the module but it does not work as well. I do not know what to do and what to think because when I insert the coupon code in the page checkout_payement.php the subtotal in checkout_confirmation.php not even display the coupon module.