Can I restrict selected SunSystems users from posting to prior financial periods?

Permissions in SunSystems are defined and allocated by user group. Period posting restrictions are defined globally in the SunSystems ledger setup, and then refined by operator group in the miscellaneous permissions as part of the security configuration. Users in a group can be restricted to posting journals to their 'open range' of periods, which could be to the ledger 'current period' only, if required.