Hi Guys,

I am trying to set up a simple percentage based attribute for all of my products, that works when a special price is added.

This shop sells raw coffee beans. All of their prices are for 250g bags.

They also offer 125g and 500g bags, which are 50% and 200% of the original price respectively.

For example:

My Coffee - £15.68 per 250g.

I add an attribute called 125g, and set Price Factor as 0.5, and Offset as 1.

When the customer chooses 125g, the price is halved to £7.84.



All good so far.


I set a 'special' price of £7.50. Zen Cart says this is 52% discount.

What needs to happen is, when 125g is selected, the price halves to £3.75.


When the customer orders 125g of this special, the price in their shopping basket drops to £-0.34 (minus 34p).



The product is not 'priced by attributes', and "Apply Discounts Used by Product Special/Sale:" is set to "No".


A screenshot of the attribute layout is here:

http://img128.imageshack.us/img128/1...tibutescn3.png