Changing Closed Invoice 1099 Data

We are putting out our 1099 reports, but our system was never set up with 1099 vendors, so we have hundreds of invoices that need changed. How can I retroactively change them so they come up correctly in reports?

If B1 can't do it, what tables are affected when an invoice is added with 1099 data? Can I just do a batch SQL update on all invoices to specific vendors to the correct 1099 forms and boxes?