After you create an add-on feature, you can install it to a new or existing object store. To install an add-on, you must have domain-level write permission. In addition, to import data defined in the add-on import file and to perform the operations in the pre- and post-import scripts, you must have any additional access rights that are required for those operations.
When you install add-ons to an object store, you might notice system-provided add-on features that are not supported by your product. When you create or update an object store for your environment, choose only those add-on features that are supported by your product or application.
Each add-on user-defined property reduces the row size from what already is reserved by the current system and add-on properties. If you are in doubt about whether you need an add-on, wait to install it until you can confirm that the add-on is necessary.To install an add-on feature to an object store: