Sale offer

[Vejgaard]

Hello

I've got a small problem. I created a product and written on the shoe sizes. For example. size 38,39,40 Each time it increases one size increases the 5 euro.

But if I put the item normally costs 50 euros and I put the product on offer to 40 euros Then a increasing of the product is not working if I select a size 39 or 40. For example. size 40 to 40 euros plus 10 euros in additional cost. will end to 50 euro

It says it only costs 40 euros. Anything I can do about it?

Another thing is when I put check marks in the product must be on offer, I can not remove it again :-(