AI generated answer (using internal Slack threads):

Based on the conversations, the "Override Period Restrictions" permission in NetSuite allows users to add and edit posting transactions even if the transaction type has been locked for a period. However, this does not apply to closed periods. In NetSuite, locked and closed periods are two different things. During the month-end process, Accounts Receivable (AR) and Accounts Payable (AP) are locked first, preventing users from posting transactions such as invoices and bills to that period. Users with the "Override Period Restrictions" permission can change non-GL impacting fields like description in a locked period. Once the month-end process is complete, the period is closed. No one, including users with the "Override Period Restrictions" permission or even an admin, can make changes to posting transactions in a closed period. The period must be reopened before these changes can be posted. If you want to prevent users from posting to locked periods, you can remove the "Override Period Restrictions" permission from their roles. However, there might be some roles that need to do some final posting after everything is locked. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******