Can I upload the Bill Reference?
The Reference field is only available for Accounts Receivable invoices. For Accounts Payable invoices – Bills in the fmAccounting Link file – the Xero InvoiceNumber value is displayed as the Reference in the Xero interface. The Reference field from the Bills table is populating the InvoiceNumber in Xero which then appears as the Bill Reference (e.g. BL1305).