We had a problem that the taxes were not calculated properly. The shop is displaying taxes like normally in EU it is the way in consumer business, and the shipping has also sales taxes in it. Previously a discount coupon given to FREE shipping (only that, no amounts), gave the discount amount as the shipping amount minus taxes. Now after installing this "module" or "fix", it goes correctly.

PREVIOUSLY:
Shipping fee: 16.00 euro
Discount coupon: -13.01 euro (missing the 23% of tax compared for the sh

NOW CORRECTLY:
Shipping fee: 16.00 euro
Discount coupon: -16.00 euro

Just wanted to report that people who had similar problems knows that this fix helps on those cases. We have version: v1.3.9h.