Hi,

In GL, you can edit the fiscal calendar and close the period so that postings won't be allowed to that period. In your submodules, most new modules have a Company Profile option called 'Validate Ledger account'. You can set that so, if a user enters a transaction date within a closed GL period, the system either warns them that they have done so or disallows the transaction altogether until they change the date to one that is valid.