There are certain transactions that you might not want listed in your Cashflow. A perfect example would be a transfer of funds from one account to another. Any transactions categorized as transfer, or any of its sub-categories, are not included in the cashflow.
Uncategorized transactions are also not included in your cashflow. Its important to categorize your transactions to have a good understanding of where your money is going. You can categorize these transaction types as you like by clicking on the "Categorize now" link below.