Order Product List tax amount error

I was getting a strange rounding error in the product list of the administration / sales / order screen.

Was not sure if it was something I had done, but after drilling through the stack I think it is due to line 21 in classes/order_product.php where the tax amount is being cast to an integer in method save(). Removing the (int) cast appears to resolve the issue.

Thanks for the feedback.

We will fix that on our end as well. Actually, like for the price, you should use to be sure that you'll never get a SQL injection in the query.