Use a specialized set of Apex methods and
keywords to create, update, or delete external data that corresponds to external object
records.
Writable External Objects
By default, external objects are read only, but you can make them writable. Doing so lets Salesforce users and APIs create, update, and delete data that’s stored outside the org by interacting with external objects within the org. For example, users can see all the orders that reside in an SAP system that are associated with an account in Salesforce. Then, without leaving the Salesforce user interface, they can place a new order or route an existing order. The relevant data is automatically created or updated in the SAP system.
Considerations for Writable External Objects Understand the limits and considerations for writable external objects in Lightning Connect. Creating, updating, and deleting external object records aren’t perfect processes because the affected data is stored outside the Salesforce org.