“如果说，犁是人类最早的发明之一，那么远在人类生存之前，土地就已被蚯蚓耕耘过了，并且还要被它继续耕耘。”这是达尔文对蚯蚓的赞誉。下面也请同学们来夸夸蚯蚓的“功劳”。(要求至少两点)

Axel, a German furniture manufacturer, ordered 2,000 metres (m) of a particularly high quality coloured cloth from Beni, an Italian cloth manufacturer. 1,000 m of the cloth was to be red and the other 1,000 m green. When the cloth was delivered Axel found that the green cloth had been replaced by blue cloth.In spite of the change in the colour Axel used all the cloth without informing Beni and managed to sell all the furniture covered with it at its usual price. However he refused to pay Beni the full contractual price for the blue cloth as it was not what he had ordered.Required:Assuming that the UN Convention on Contracts for the International Sale of Goods applies, explain the rights and liabilities of the parties involved. (10 marks)