Create cancellation invoice

[Jurist]

Hello,

To make every day tasks easier for the stores I am working for, I've received a request to allow cancelation invoice to be created. It needs to be simple document, similar to an invoice, only with values negated. I know that invoice is generated with the link in back office:

submitAction=generateInvoicePDF&id_order_invoice=11111

I am going to create a similar button, with Generate cancelation invoice name, link probably will need to be something line that:

submitAction=generateCancelationInvoicePDF&id_order_invoice=11111

I know the method needs to be created, in AdminPdfController.php file. The problem is, where the invoice data is loaded from?

Function getInvoicesCollection doesn't show anything interesting, it's only related to getSibling method of OrderInvoice.php

Where do I negate the values on the invoice? In the other places some values would need to be zeroed.

Thanks

 

 

[tuk66]

It is called Credit slip. You can fully refund an order with the option to create the credit slip.