communication of proposed adjustment u/s 143(1)(a)(vI)

Hi,

I got the notice for proposed adjustment U/S 143(1)(IV),I filled ITR 4, and show income as per section 44ad 6 % of 19,00,000/- which is actual Bank receipt, but my 26as showing 12,00,000/ on which TDS DEDUCTED IN u/s 194j, now income tax department said you have shown nil value in under income from business and profession,and your 26as showing 12,00,000/


now my quire is what to do if I have options to take benifit sec 44 ad, so why I show 12,00,000/- instead of 6% of 19,00,000/-


please give me guidance what reply I should need to fill.