Define Extension Entities
Once you have created your extension, simply define the entities exported by the extension. These entities allow you to use database tables that exist outside OutSystems.
To publish a new extension that contains entities, your OutSystems user must have the "Allow External Entities" permission. Check with the Service Center administrator for a list of your permissions.
To add an entity to your extension, do one of the following operations:
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Add the entity manually to the extension.
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Import the entity definition from a database, through the Import Entities from Database wizard.