Consider the following guidelines before you import the extension assets:
•Set up the prerequisite extension application.
•Import the extension assets before you customize the business entities in extension. When you import the assets in an environment that already has an extension with the same business entities, the import fails. You can safely import multiple extension assets that use different business entities and in different business applications.
•After you import the assets, consider them as your custom assets.
•After you deploy an extension, you can't upgrade to a newer version of the extension.