A journal entry is posted in a period to which the journal entry approver has access. Until a journal entry is approved, NetSuite displays the posting period based on the transaction date. If this period is locked or closed, the posting period is determined by the accounting preference Default Posting Period When Transaction Date in Closed Periods.
You can unapprove an approved journal entry by editing the journal record and clearing the Approved box. Do not clear the Approved box if the journal entry is linked to a payment transaction. You must unapply the payment before you clear the Approved box.
If you want an approved journal to post in an adjustment period, you must edit the journal, approve it, and select the adjustment period as the posting period.