In the first test for the 2007 Birdsville Amendment, aimed at stopping predatory pricing by large retailers, the ACCC has blocked a supermarket plan to sell fuel at a heavy discount.Coles had planned to offer a new round of so-called discounts of up to 40 cents per litre on fuel as a reward to customers for purchasing Coles groceries valued between $100 and $300. The Australian Competition and Consumer Commission (ACCC), however, deemed the scheme to be predatory pricing and blocked the plan.Acc…