Accounts Receivables or Accounts Payable account cannot be associated in the manual journal. Please contact support@zohobooks.com for further assistance.

Accounts Receivables or Accounts Payable account cannot be associated in the manual journal. Please contact support@zohobooks.com for further assistance.

When trying to create a journal, I get the following message:
 Accounts Receivables or Accounts Payable account cannot be associated in the manual journal. Please contact support@zohobooks.com for further assistance.

Help/Advice?