Entries are not posted to Bank Reconciliation when journals and registers are posted while other users are in Check, Deposit and Adjustment entry. Current Balance for bank code is updated with the transaction amount causing an Out of Balance in Bank Rec.
Looks like an issue in 4.3 to 4.5 - with a fix possible in v4.5 PU 6 (yet to be released)
https://partners.sagenorthamerica.com/irj/go/km/docs/sageKM/Sage%20MAS%2090%20and%20200/Gated%20Customers/Warr_Svc_Support%20Plan/110-9000196.xml