Notice U/S 142(1) after filing return U/S 148.

My brother has been served a notice U/S 142(1), asking to provitsome documents of income,, in the letter it is mentioned that, return has not been folled in response to notice u/s 148 sent on.......,

But the my brother has filled return in response to notice u/s 148, for the relevant F.Y., in due time, and the return is available in the IT portal, now what should he do, in this case.