Incorrect Account type reclass from Revenue to Expense

We went live in April-25 and we noticed after loading all the TB's some of the expense account was wrongly setup as Revenue account due which it is impacting the FRS report and the balance of such accounts are reflecting in Positive balance, Now we want to re-class these incorrect account type to correct account type i.e Expense. Since the balances are also there in these account, what will be the impact of account type reclass in the mid of the fiscal year. Please advise.