Did you all try to clicked continue to payment already.. because before add to cart you have to select shipping (6,99) and then it adds it to your card.. then in that shipping part you enter you country etc and with the new settings you given the option 0,0 shipping ( because you already said 6,99 before adding to cart.. so click continue
so the error later on when you already added to basket with the option 6,99 shipping.. the unnecessary 0,0 shipping cost option is just gone
you can click all the way to when you are in paypal
/emoticons/
[email protected] 2x" width="20" height="20" />