Defective return for the a,y,16-17 u/s 139 (9)

Dear Sir/Madam i am file my retrun for the A.Y,2016-17 in ITR4 and i will show income head of profit & gains.My income is commission and i am not claim any expenses and full amount show in retun & i am also not filed Balance sheet & profit & loass account with him.Now i am received notice from IT departments,say that your return filed by you is defective and show ther erroe that you can not filed balance sheet & profit & loss account.so what shoul be i do return revised or what reply should be given to IT departements.

regards Amit