Multiple Price Books for the same product

Hey zoho I've created 2 price books one for a direct sale to a customer and another for a sale to our distributor. I added the same products to both price books and when I go to create a sale both price books show up but I can only click on the first price book that I created. The other I can click all I want but nothing happens. Do I need to have different products for different price books or is this just a problem with the system? Thanks for your time.