Can Valuation Method formula be changed in middle of Fiscal

I was wondering if i can change from FIFO to Moving Average or vice-versa. After i have added some stock recon and invoices in my current fiscal year. Or should it be changed only on a fresh fiscal year before adding opening stock balance.

Default system will not allow you to change it and it is also not allowed to change valuation method by accounting principles as it is manipulation


Thank you @Pawan