We need the ability to apply open Credit Notes toward invoices generated by recurring invoice as the first, priority payment. This should be an option that we can enable/disable in the recurring profile and/or the Credit Note. Other invoicing systems can do this. I'm not sure why Zoho Invoice doesn't have it.
Here's an example for a Recurring Invoice...
If a customer has open Credit Notes, and a saved credit card set for auto-pay, once an invoice goes out, the credit balance gets automatically applied toward the balance of the invoice.