A FORMER bank clerk, aggrieved at the performance rating his boss awarded him, decided to get even by falsifying accounts totalling $2.3 million in his employer's computer ledger, the District Court was told. Shanman Cheung Chun-hei, 29, a former investigation clerk with the Standard Chartered Bank, pleaded guilty to 12 offences of false accounting. Judge Hartmann sentenced Cheung to two years' imprisonment after taking into account his plea, his confession to his employer (who had been unaware of the offence) and his serious tuberculosis, which required daily injections. Defence counsel David Tolliday-Wright said Cheung had been employed by the bank for 10 years. He worked as a senior clerk for about $8,000 a month at the bank's Cityplaza customer services centre, and was often required to access general ledger information in the bank's computer and to extract and inspect vouchers and other documents in the centre's records. Counsel said Cheung became angry about a poor performance rating given by his supervisor, regarding it as unfair because of his extremely heavy workload. The report was later toned down but his resentment grew and he decided to create chaos by ''fiddling with the computers''. Mr Tolliday-Wright said Cheung falsified 12 deposit slips over six weeks and joined some bank colleagues to gamble in Macau. He won some money then lost it all. He then borrowed from loansharks and lost that too. Two months after the last offence, Cheung went to his manager and confessed. Earlier, Crown counsel David Chan said that of the 12 falsified bank deposit slips, one had been a repayment of a loan to his mother. The rest went to accounts provided by the loansharks.