GST received / paid in ITR3 P&L

I am a regular GST registered dealer.

While filling P&L in ITR3 for AY 2018-19, there are items such as GST received (CGST, SGST, etc) on sales which are getting added to arrive at total revenue from operations on the CREDIT side. Similarly, on the DEBIT side there are items like GST paid (CGST, SGST, etc) on purchases. But in our books of accounts we would not include GST received or paid in P&L. Thus there would be aa mismatch between the two. Could you plz clarify and elaborate on the above case?