Last month, James, who is the trainee civil engineer of Prime Construction Ltd with monthly salary HK$20,000, had damaged carelessly 2 equipment in two construction sites with cost HKS2,500 and HKS3,500 respectively. His employer deducted HKS6,000 from his salary to compensate the employer's property loss. Advise James as to the legality of his employer's salary deduction action under the Employment Ordinance.