The invoice settings in your account settings control how A2X creates the Xero invoices when posting them to your Xero account. By default A2X will summarize all sales data and post the invoice with a single sales line item. You can choose to group by SKU, or product type (if you have defined any). If you group by SKU, we will pass SKU and quantity data to Xero too, but note this requires all your SKU's are already registered in Xero. These settings do not apply automatically to old settlements, refresh a settlement to apply new invoice settings.