Hello,

I've installed OpenERP 7 which is connected to Magento.

I want a product to have multiple purchase prices. Example : There is a first purchase order for 10 products for 10$ each. Then, two months later, I do the same order but I get a 50% discount so I'll get 10 products for 5$ each.

I want to keep the information in my system that I can sell :

• 10 products for 10$ in my point of sale or Magento,
• (Then) 10 products for 5$.

I need it also for the reporting modules. 

I don't know how to start ? Can you help me ?