THE Chief Justice, Sir Ti Liang Yang, dismissed an appeal against a shop salesman who wounded an American tourist and said the territory's commercial integrity must be protected. He said there were many similar cases, but few were reported. Iu Pui-choi, 26, was found guilty after trial at South Kowloon Court last December of wounding American tourist Mr Suresh Jamu Tewani, who was punched and kicked, had his head banged with a computer and his shirt torn and gold chain ripped off. Iu was sentenced to four months' jail and was appealing against his sentence yesterday. His co-accused, Tsang Hon-yin, 19, who was sentenced to a detention centre, had his conviction quashed. Assistant Crown prosecutor Mr Stephen Wong conceded that the magistrate should have dealt with the issue of joint enterprise when dealing with Tsang, but did not. The court heard that both men were salesmen of Hankyu Camera and Audio Company at Nathan Road, Kowloon. Last November Mr Tewani arrived from Miami. On November 19, he went into the shop to look at a computer. He asked the price, agreed to buy it for US$220 (about HK$1,700) and handed over the money. While waiting for the computer another salesman approached Mr Tewani and tried to convince him to buy a different model. He was also told he had to pay US$40 for five batteries for the computer. Mr Tewani became suspicious and asked for his money back. He was then told by Iu to get out. Mr Tewani was the only customer in the shop and there were seven salesmen. He was again told to leave, but he refused unless he got his money back. He was handed the computer, but refused to pay for the batteries because he had seen them taken out. As he was walking out of the shop, the computer was grabbed from him and his shirt was torn and his gold chain snatched. He was punched in the jaw and arm and pushed. Mr Tewani followed the salesman, who had grabbed his chain, back into the shop and demanded its return. There he was beaten on the head with the computer after which his money and gold chain were handed back. Mr Tewani reported the matter to patrolling policemen. He was taken to Queen Elizabeth Hospital with a three-centimetre cut to his head which needed five stitches.