How to put debit/ credit note in gstr-4? How gives it effect in sale & purchase?

Reply-While filing GSTR-4, the taxpayer is required to declare tax rate wise details of outward supplies / inward supplies attracting reverse charge during the year in Table 6 which is Net of advances, credit and debit notes and any other adjustment due to amendments.

So there is no need to show the amount of debit or credit note separately, the amount of outward supply should be declared net of all adjustments.