Periods and fiscal years can be soft closed to prevent posting to those periods. When a period is soft closed we should receive an error when trying to validate or post to that date. When saving a journal entry, we should receive this message, if a line has a post date that is included in a soft closed period.
We are currently investigating this issue and will update this article.
Steps to Duplicate
1. Go to GL > Journal Entry. 2. Open a saved batch. Edit the post date to a period that is soft closed 3. Click save and we should see the error : Post date must be in a valid or open period, but instead, the journal entry is saved with the changes.