When updating a tracking number using the completesales on version 805(using api test tool) it will not update a tracking number for a shipment.
It will not work for single item orders, or multiple item orders, it merely returns success.
If I submit with transactionID and ItemID it will update. Getting both of these is possible (orderID is them both hyphenated) but for multiple line orders through the cart flow that is not possible.
Does anyone know why I can't update tracking numbers with OrderID?
XML Below, through API Test Tool
<?xml version="1.0" encoding="utf-8"?>