QBO Sync Error - The account period has closed

Issue:  

When user tries to update the Invoice is already existing in QBO and Invoice # is "7925" and its transaction date was on "2020-09-15", but user is trying to update the txnDate to "2021-07-14".

Error :  The account period has closed and the account books cannot be updated through the QBO Services API. Please use the QBO website to make these changes.

In The above error, The invoice is dated for a closed period in QBO and the invoice cannot post to this month. This can happen when you receive an invoice late and happen to have closed the previous period.

Solution :

So as per the QuickBooks online limitations, we cannot update the transaction date through integration / using API services when account period was closed.  

So use the QBO website to make these changes, i,e manually update the txn-date of that particular invoice in QBO

Note : The above solution is applicable for both versions of QuickBooks(Desktop & Online)