1099 reporting process

Hi All,

I have a two 1099 vendor scenarios and looking for some help from the experts:

1.If a vendor is not classified as a 1099 vendor and posted invoices and payments are processed. But later on realized that the vendor should have selected as a 1099 vendor.so now how do we correct already processed invoices and payments? So that correct amounts are included in 1099 report and form for IRS reporting.

Is there any program or report in SAP to execute after updating withholding tax information in the vendor master?

2.If a vendor is classified as a 1099 Vendor and posted invoices and payments are processed. But later on realized that the vendor is not 1099 vendor.so now how do we correct already processed invoices and payments? So that correct amounts are included in 1099 report and form for IRS reporting.

Is there any program or report in SAP to execute after remove withholding tax information from the vendor master?

Thanks,

Anusha