ITC on Inward supplies availed in the next Financial Year - Goods and Services Tax - GST

Dear Experts, Gst audit is going on for FY 20-21. We have availed before September-2020, the ITC related to FY 2019-20 in the next FY 20-21 to the extent of Rs.4.5 lakhs. However, GSTR-9 of FY 2019-20 in column 8(C) it was reported only Rs.3.25 lakhs as per the receipt of the material during FY 19-20 but taken in next FY 20-21. The balance credit of 1.25 lakhs represents the material received in FY 20-21 and hence credit directly availed in FY 20-21. GST department proposed to disallow 1.25 lakhs as it was not reported in GSTR-9 of FY 2019-20. Please advise.Thanks.