Notice under section 143(1)

hello respected please guide me,,

i had filed one of my clients income tax return who has proprietor business that's nature is commission related. i had filed return for f.y 2016-17 and declared income under section 44AD also the same clients tds was deducted in 26 as under 194H.


now that client got notice under section 143(1) having reason that i have not considered the commission seperatly as i considered the same in gross receipt of 44ad now i have to rectify my misstake how do i do.. please suggest