AIF: Specify SalesID when importing Sales Orders

We are currently configuring the AIF module to import sales orders from an external website.

The AIF module has been configured and we can successfully import sales orders. However if we set the SalesID to be manual within the Sales Ledger parameters and re-configure the Endpoint to include the SalesID on the SalesTable and SalesLine, the import fails stating that the SalesID is an invalid Child element.

Are you able to include the SalesID as part of the import file when creating sales orders or is this field only available for update and delete transactions?