Virtuemart 403 error on Checkout Process

Hi,

we are using VM 1.1.3 and we put a item menu that has "Special" level rights. This item menu is connected to virtuemart. In spite of this item menu, when we then try to checkout, an 403 errors occurs.

Therefore, to figure out that problem, we just had to set "Registered" level to the item menu and then, it's alright.