Here you can choose whether this G/L account will be included in the Reconciliation window in the general journal. To have the G/L account included in the window, place a check mark in the check box. You can find the Reconciliation window by clicking the Posting button in the General Journal window.
The Reconciliation window is used after you have filled in a general journal (but before you post it) to reconcile the liquid resources with the day's payments received and made.