To prevent intercompany transactions from being entered during the last day of the close, you should close intercompany periods in Fusion Intercompany. This will prevent users from creating or modifying intercompany transactions for the closed periods. You do not need to freeze the Intercompany journal source in General Ledger, as this will not prevent users from creating intercompany transactions in Fusion Intercompany. You do not need to close all subledger periods, as this will not prevent users from creating intercompany transactions in Fusion Intercompany. You do not need to close the General Ledger period in the Manager Accounting Periods page, as this will not prevent users from creating intercompany transactions in Fusion Intercompany. Reference: Oracle Financials Cloud: General Ledger 2022 Implementation Professional Objectives - Configure and Process Intercompany 12VVVVVVVVVVVVVVV