Which file stores the 1099 history information in Sage 100? Reolution The 1099 history data for vendors is stored in AP_Vendor1099Payments.m4tThis file can be edited with the following steps:Open Accounts Payable, Main, Vendor MaintenanceSelect, VendorClick, Additional tabClick, 1099 History buttonSelect, 1099 Form TypeSelect, Calendar YearEdit, Year to Date amount(s)If applicable, enter State/Payer NoClick, OKClick, Accept Sage 100 Request Support