Sage describes Bank Reconciliation as a tool for locating differences between the books and the bank, recording corrections, and reconciling the two.
Timing Differences Are Normal
Outstanding checks, deposits in transit, and other timing items can create temporary differences.
Unexplained Differences Are Different
When an item exists in one system view and not the other, the reason should be understood.
Multiple Modules Feed Cash Activity
Sage notes that Bank Reconciliation integrates with AR, AP, Payroll, and Purchase Order. That is one reason cash reconciliation can involve several transaction sources.