When a period is soft-closed, you may experience the system allowing you to post to that soft closed period
We are currently evaluating this issue and will update this article when we have more information.
Steps to Duplicate
1. User A closes period 2. User B is in session when user A closes. Can confirm in configuration > fiscal years that the period is closed. 3. User B is able to successfully validate and post to closed period until they log off and back in.