reset invNo for the next financial year

Question

dear experts,

 

Last record---> 918190008091 

 

now i need ---> 918190000001

 

my SQL query is

 

select '91718'+right('000000'+cast(isnull(max(cast(right(si_vInvoiceNo,7) as int)),0)+1 as varchar(33)),7) as vInvoiceNo from Sales_Invoice

how can i reset for next financial year 918190000001