Error Message: You do not have security access to view unposted invoices.
If you receive the Error Message: ConnectWise 'GetUnpostedInvoices' returned an error: System.Exception: you do not have security access to view unposted invoices at ...
It means that your user account does not have the required access in ConnectWise, and one of your ConnectWise Administrators will need to check your permissions.
To change/edit and setup Members security please refer to the following Knowledge based article Apply ConnectWise Member Security.