Once an invoice has been generated, it cannot be generated a second time. Run the Invoice Generation Report to review generated invoices.

To adjust the invoice schedule:
  1. Go to Records > Recurring Invoices
  2. Open the existing recurring invoice record
  3. Go to the Invoice Schedule tab
  4. If the number of invoices is set to Fixed, increase the number of invoices that are allowed to be generated
  5. Click Save and Close
  6. Try generating the recurring invoice again