Unable to update payment method in magento 1.9.3.9

[therese_vollmer]

We have three orders that have an Order Status of Complete that we need to update the Payment Method on these orders in order to track a product recall. We have tried going into Order View and selecting edit on the Payment Method but that does not allow us to edit the Payment Method , is there a way to update these orders?

[AQELTech]

I don't think you can do so after the invoice been created, I would recommend you to delete the created invoice and give it another try as it should work.

[Agarwal Aman]

In Magento,  if you edit any existing order Magento will create the new order. 

You can update the Payment method by directly updating in DB  which is not recommended.

So I think one of the options is canceling the old orders and reorder with the desired payment method.

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