Fantasia Group China Co, whose controlling shareholder is Fantasia Holdings, said on Monday it would adjust the trading mechanism of its Shanghai-traded bonds following credit downgrades by China Chengxin International Credit Rating Co (CCXI). Fantasia had appointed advisers on Friday after it shocked markets by missing a bond payment earlier in the week. It saw its bonds dive from almost 100 cents on the dollar to just 20 cents, as just a couple of weeks earlier it had said its liquidity was fine.