Can you just set one account code in Xero? Or can you set multiple account codes (i.e. Different account codes for different types of jobs)?
Additional setting just deployed. If the "Use the SOR Item Account Code as the line item's Account Code in Xero" is checked, for Receivable Invoices it'll use the account code from the SOR item. If it's not a SOR line item, e.g. the Labour or Materials, it'll use the Default Xero Account Code.