Discount not at Amazon Payments

Hi,
I'm using OC 2.1.0.2 and have activated Amazon Payments. Everything works fine so far.
I've now a discount month were I give 10% to all products. Discount is calculated as expected and total amount is being displayed as expected.

When I login and pay now with Amazon then the total amount is being charged to the customer by Amazon instead of the discounted total.
I guess the wrong amount is handed over to Amazon.

For the discount calculation is use the follwing mod https://www.opencart.com/index.php?rout ... 817&page=5

Any idea/hint/fix?

Thanks, Chris

still looking for a solution... anyone has an idea?