When you export a Line Item invoice from Invitbox to Xero we can only send the same details as a service invoice. It will show the quantity as 1 unit and the line price as the unit price. Therefore even if invitbox extracts product codes, quantities and unit prices, it will simply send to Xero the total value of the row, and the description of the item.
You can however look at the actual invoice image within Xero to see the unit price, quantities & product codes.
The invoice image below shows you how to view the image, as well as showing you how the invoice line details will look once they're in Xero.