ServMan allows you to Lock and Unlock accounting periods as well as Close accounting periods.
Periods are Locked to ensure no new transactions are posted to a period, however there is no financial validation when locking a period. It is simply a quick way to block transactions from affecting the locked period.
1. Select Utilities -> Lock Accounting Periods
2. Select the period prior to the period you want to unlock and press OK.
Periods are Closed to also ensure new transactions are not posted to a period however, this process DOES validate all financial transactions and posts them to your General Ledger. To learn how to Close a period, click HERE.