SUM each Payment row Running Total (YTD) by Vendor ID/Name?

Summary:

My code succeeds when my query for one Vendor, but needs to be reset for the whole report (muliple Vendors)

A running total ( YTD Amount) for each group of Vendor payments, but needs to be reset when Vendor_ID changes so my ROWS BETWEEN clause is in error when a new Vendor is read

Select VI.Vendor_ID,

VI.Vendor_Name,

VI.Address_Number,

VI.Individual_Tax_ID,

VI.License_Status,

VI.EEO,

VI.classification,

CI.check_date,

CI.Payment_Amount,

SUM(CI.Payment_Amount) OVER(ORDER BY CI.check_date

ROWS BETWEEN UNBOUNDED PRECEDING

AND CURRENT ROW) YTD