The confirmed date (CONF date) cannot be added to the import job for customer orders (COAUPLOAD - INP/37224) as this field is calculated by RamBase and not something that can be added to the standard load.

The confirmed date is normally not entered manually when creating the customer order item (COAITEM). 
When creating the customer order item (COAITEM), the request date is added to the customer order item (COAITEM) and the item is assigned to document items in the stock assignment register (SAR).

Based on this assignment, RamBase calculates a date that is set automatically in the confirmed date field (CONF date).

After that, the user can manually change the confirmed date if necessary.