I can't get prorating to work. If plan A for $250per year and Plan B for $500 per year are both parents (with no children) and both set to allow prorating, how do I make prorating work? The manual says the new plan (B in this case) must be a higher value (it is) and the initial plan (A) must be prohibited. What do you mean by prohibited? Where do I set that? Do you mean the plans must be set to exclusive? Or do you mean there must be conditional settings set up in Plan B's workflow tab (if so what should the settings be?)

Currently when I am subscribed to Plan A and add plan B to the cart, The price for plan B shows the full price instead of prorating Plan A's value.

Thank you for your help.