The WDTU application that we have created in the following section falls within the defined restrictions for an Extension since we only added new objects. We have not changed any existing Microsoft code, only added fields to a table.

To create the Extension, we need to run Windows PowerShell and use PowerShell commands that Microsoft ships with the product. See the NAV 2017 Developer and IT pro Help: How to: Create an Extension Package at https://msdn.microsoft.com/en-us/dynamics-nav/how-to--create-an-extension-package.