I worked in the software development area. Our company would call it the Engineering Change Order for Code Change. There were many change orders depending on whether it was an addition to the code, or enhancement. Sometimes, it would be required to process a change order for even maintenance especially if it would be server maintenance. I remember specifically, the code change order was the most tedious one as it would go through many approvals from top-down since it would involve a whole new invoice with the contractors apart from the existing contract.