How do I change the Accounting System Expense Account for a specific Invoice?

To change the expense account associated with a specific invoice, navigate to that specific invoice.

Then, go to the Chart of Accounts section within Finance Details for that invoice, change the Accounting System Expense Account for this Invoice, and press the Resend information button.

If you would like to change the Accounting System Default Expense Account field for all future invoices for a specific Vendor, you can do that on the back of the Vendor Card.