does my boss have the right if company deduct staff salary each time there is any mistakes done.
What kind of mistakes? Normally, he can't do that.
mistakes like take the wrong order, write a wrong amount or item or send wrong item
I can only say such deductions are not lawful under Section 24 of the Employment Act and it may not solve the problem also. Such mistakes are quite serious and should be avoided. Try to device a better checking systems so that such mistakes can be avoided or reduced.