- Add the menu item "Payment Schedule" which shows all the outstanding AR/AP records.
- Payment Schedule should show accumulated residual amount to facilitate users' projection on cash balance.
- The new column Begin Balance of the first row is based on sum balance for accounts of type "liquidity" - Identify the period of the latest opening entry and sum up the amount of the relevant account_move_line records whose period is equal to or greater than the identified period. In case there is no opening entry all the account_move_line records are considered.
- The records of in and out payment are based on account_type ['payable', 'receivable'], and we ignore items from Opening Entries Journal.