An attempt was made to modify a Invoice with a date that is on or before the closing date of the company.
If you are sure you really want to do this, please ask a user with Admin privileges to remove the password for editing transactions on or before to closing date (this setting is in the Accounting Company Preferences), then try again.
An accounting period in QuickBooks has been closed and a password has been set.
Communicate with the employee in charge of QuickBooks. Explain QuickBooks has closed that accounting period and it will need to be reopened before being able to post to QuickBooks.