Itr 4 presumptive taxation

Yes, If ITR 4 filed under old regime, Chapter VI deductions are allowed..

However, if he/she has claimed deduction under sec 10A/10AA/10B/10BA or under section 80RRB or sec 80HH cannot opt presumptive scheme of taxation under section 44AD.

and the person opting for presumptive scheme cannot claim any further deduction under section 30 to 38 however is eligible to claim deduction under chapter VI A of income tax act, 1961