Corrections u/s 154

If in notice it asked you then otherwise not
actually in
154 notice you have either accept the notice or disagree with notice if did not agreed then have to give reason why you disagree and summit
and after submission a refference number will generate and sent for processing to cpc Bangalore

When you're income tax return proceed income tax department send you a intimation letter in the form of 143(1) showing the calculation of your and as per there's if no mismatch between two no demand arises if mismatched then they arise a demand 

Again if you agree with the demand then pay 

If you disagree with them then gives reason and summit then signed and send that to cpc