Utilisation of amount in cash ledger

Hi all

one of our clients have got about 1,600 rs credit in their cash ledger (800 cgst and 800 sgst). Upon review i realised that the same has accrued by way of reversal of late fee paid by them in respect of returns for the months july and august.

Can this amount be used to pay off late fee for the current month...?

Thanks in advance

Vignesh P