1. Click on Accounts Payable > 1099 Forms > Extract, Sort, Edit 1099 > Define and Edit 1099 Vendors.
2. Press C to change.
3. Enter the vendor ID.
4. Select Field 8 or 9 and change the Control Name to fall within the necessary guidelines.
5. Select Field 13 or 14 and change the INT. Control Name to match.
6. Press ESC and then E to end. 
7. Enter 0 to accept.