If you enter a transaction in Bank Reconciliation using a code that updates the GL (i.e. a transaction code that allows you to change the period/year), GL transactions will be created.
Entries entered directly into GL Manager (journal entries) do not update Bank Reconciliation (manual entries will have to be created in Bank Rec).
Note: AP and Billing and AR Modules talk to the GL, the GL does not talk backwards to the other modules.