Table 4F of GSTR 9 - Goods and Services Tax - GST

Hi, Table 4F of GSTR-9 demands details of unadjusted advance during the FY. But in a scenario where advances that remained unadjusted in last FY but invoice is issued in current FY. How should this be addressed? Currently the portal is giving an auto populated negative figure in Table 4F. But not sure if it will accept while filing the return. Even if it does, is it right to show negative figure as this scenario has not been covered by instruction sheet of GSTR 9 . Thank you.