After changing the fiscal year

Initially I was set wrong fiscal year(ie wrong dates/month) in ERPNext
After that I tried to edit that fiscal year but not found any edit option
So I created a new fiscal year with accurate dates/month and I set that as Default
later, I found that there is a change in Supplier’s(Buying–>Supplier) Outstanding amount(Total Billing This Year: Rs 0.00 / Unpaid: Rs 0.00) is it showing zero.
So how can I register the data again n the company’s fiscal year?