The Tax ID must also be entered in the 1099-Misc Fields section in Define and Edit 1099 vendors. 
  1. In Accounts Payable, go to 1099 Forms, Extract, Sort, Edit 1099 Vendors.
  2. Click Define and Edit 1099 Vendors.
  3. Type C to Change.
  4. Enter the vendor number and press Enter.
  5. Page Down to the Misc Tax ID field (the field # is different based on setup).
  6. Type the field # and enter in the Misc Tax ID and press Enter. 
  7.  Press Esc and type 0 to accept changes.
  8. You will now need to re-produce the forms.