If you have a Reckon One account you can export your Invoices form FieldInsight to Reckon.
Setup
Open the Integration page
Open the integrations page in settings - Integrations and click the enable button to setup the Reckon integration
Login to Reckon
Enter your Reckon username and password in the Reckon popup
Click Yes, Allow to give FieldInsight access your Reckon account
Select your cashbook
Click on Cashbook and select the book that you want to export Invoices to
Configure tax and accounts
Select the account that you want to use in Reckon
Import contacts and Inventory from Reckon to FieldInsight (Optional)
Click on the buttons to initiate the import fro contacts or inventory
Close the Reckon popup
Export Invoices
To export an invoice to Reckon, click on the Export button on the invoice or select all the invoices to export and click Export to Reckon