How to correct itc in balance sheet

dear expert
my one firm has audit report 2017-18 . in which audit report I could not show the GST ITC adv balance rs 15 lakh something. but credit ledger of GST portal shows. and now fy 18-19 l avail the ITC. now problem is that ITC is as opening balance difference in my books of account. due to this reason more problem is here to final audit report of 18-19