How to have monthly payments for a sales order


I tried to do this but it seems ERPNext does not support it.

I have a quotation for a customer that consists of a yearly support contract. The amount in the quotation is the amount per year, however, the payment is monthly.

I have generated a sales order but I set delivery date to be 24th december 2019 which is wrong. That caused the sales order to be overdue.

I tried to change the devlivery date to 30th november 2020, but it did not work. Change is not applied.

How can I solve this? Is there a way to configure a sales order or something to be monthly payed?