Regarding time limit of credit note liability..

sir,
we issued credit note in Aug 2017,But Credit note liability not utilised or reduced for FY 2017-18, 2018-19 and 2019-20 ..Now my query is Can we claim the said credit note liability in FY 2020-21..Is it possible to utilise the 2017-18 FY credit note liability in FY 2020-21? what is the time limit to utilise the credit note?
thanks in advance...