In their journal entries, you cannot use Accounts Payable or Accounts Receivable more than once. For example, I owe company "A" $100, so company "A" is Accounts Payable, and I just want to list it one by one by one. If I want to add more companies, say, company "B" with $200, I can't list Accounts Payable in that entry. I would have to just say, company "A", $100, company "B", $200, Accounts Payable, $300." That's a shortcoming of it.