Removing 1099 preference from accounts

I want to change our chart of accounts and want to remove some accounts from being a sub-account.

When I uncheck the box for subaccount in editing an account I am told I have to take the 1099 preference of the account.

Going into the Edit/Preferences/Tax 1099 to remove the account from this 1099-reporting, I am not able to remove the accounts. I even tried to click Do not report 1099's but nothing works.