Before you can post journals, you must open the periods for each scenario to which you want to post. You cannot post journals to an unopened or closed period.
By default, all periods have an initial status of Unopened. You can open and close periods as needed. However, after you open a period, it can never revert to the Unopened status.
You cannot close a period if there are unposted auto-reversals in the period. If you close a period that contains approved journals, a warning message is displayed.