The following contributes why reconciledtransactions become unreconciled:
1. Thetransaction was edited.
- A user receives a soft warning when editing a reconciled transaction "This Transaction has been previously reconciled. Changing the amount will unreconcile the transaction."
2. The check mark on the CLR boxwas removed.
- Navigate to Lists > Accounting> Accounts> Bank Register.
3. The check mark on the Reconcile boxon the reconcile bank statement page was removed
- Transactions > Bank > Reconcile Bank Statement.