Tried out the official VM Demo with a produt.
It seems that VM does not show the tax separately for discounts by defalt - what is definitively wrong.
If you give a discount in german you have to calculate with tax and show the customer tax + price discount.
If you want to give 10 € discount - it must be net. 10 € + 19% Tax. = 11,90
or 8,40 EUR + 19% Tax = 10,00
In the sample attached the tax price is not correct in relation to the total amount the customer has to pay.
That means I take more tax than allowed.