How to assign Affiliate to invoices and future recurring payments?

An affiliate did not get credit for a client's order. The product is a recurring product.

I manually assigned the affiliate to the client's order however it only displayed the initial order and not the 2 months of payments following the initial order.

How do I assign this affiliate to the 2 missed invoices so he can be paid, and also how do I add him to all future recurring payments so he can be paid?

Detail:
Jan - Initial order with recurring monthly payments - I manually added affiliate and WHMCS shows correct commission on initial payment
Feb - recurring payment - affiliate is not getting credit
Mar - recurring payment - affiliate is not getting credit

Thanks