2020 1099 Adjust Withholding on Paid Vouchers

Following instructions from the 'New 1099-NEC IRS reporting requirement effective tax year, 2020' document in our test environment. I have updated all applicable supplier records. I processed payments for testing with another project and some of the suppliers I adjusted have payments with the NEW 1099N or 1099M type and classes.

I now have some suppliers that have both 1099 AND 1099N transactions. I am attempting to update Withhold Adjustments and have two different types of withholding transactions now. I have chosen to add a CR amount to zero out 1099 transactions and add a DR amount to create the new 1099N or 1099M amount, but when I try to complete the fields, I have no options for the Class or Rule on the 1099 row.