Yes you can, within the security profile
Click Edit and then click Corrections
Drill down on the Nominal Ledger
Drill down on Transactions and select the Header
On the right, clear the Allow Period and Year to be Open Periods Only option.
Close the Corrections options window.
Click Save. You will now be able to move journals to a closed period
Note: This is still limited to Current Year and you will not be able to move transactions any year prior to Current.