Invoices must have status of Completed to be moved to Posted using the below steps:

  1. Select Settings > Maintenance
  2. Here you will see the option, Sales invoice - move to posted, tick this option
  3. Enter the invoice number you wish to mark as posted and click Search
  4. Click Change Sales Invoice Status, a message box will pop up stating Please confirm OK to proceed. Proceed only when you have confirmed the sales invoice has been posted to QuickBooks Online US
  5. Click OK