Debit note issued to supplier

I issued a debit note to my supplier and voluntarily reduced my itc in the table 4(A)5 of 3B in previous month my supplier filed the credit note in the next month , I accept his credit note since it is genuine and I have returned the goods to that extent , but there is one issue I had voluntarily reduced my itc in previous month now after I accept the credit note in ims my GSTR 2B DATA has reduced itc to the same extent which I had reduced in the Table 4(A)5 in the earlier month now how to avoid this double reduction in ITC and keep my GST RETURN AND BOOKS CLEAN and yet help my supplier also TO REDUCE HIS OUTPUT LIABILTY TO THE EXTENT OF GOODS RETURNED