Data must exist in Vendor Maintenance, Additional, 1099 History for the applicable calendar year for the appropriate 1099 form calendar year to appear.

No data exists in AP_Vendor1099Payments for that calendar year

1. Open Accounts Payable, Main, Vendor Maintenance.
2. Select applicable 1099 vendor.
3. Click Additional tab.
4. Verify you selected Form Type.
5. Click 1099 History button.
6. Select applicable calendar year.
7. Verify dollar amounts exist in at least one field.
8. Click Accept.
9. In Form 1099 Tax Reporting, the 1099 calendar year will now be available in drop-down.

How to reconcile 1099 vendor amounts
How to Set up 1099 Vendor