Enter a default Accounts Payable Summary account to be used in the radio button section, and list any additional Accounts Payable Summary accounts for different funds in the table below. 
If you are not prepared to enter a default account, perform one of the following 2 workarounds:
  1. Exit and sign out from the program and log in once more, navigating to a different screen.
  2. Enter any account temporarily as a place holder. (Please remember to change this later, or the account will be used by the system.)