Data source setup
DataSource settings allow you to configure an internal or external data source to pass data to the List to display alongside values from the object the List is based on.
Adding a data source in the builder screen
Press the 'DataSource Setup' button in the top right corner of the builder screen to go to the DataSource setup screen.
DataSource types
Internal DataSources are used when you want to look up related objects in Salesforce to present data together.
For example, if the Lookup object is specified as Product2 and you want to display the unit price from a PricebookEntry, you can use an internal data source to look up the PricebookEntry that meets the criteria, and display the product and unit price together.
External DataSources are mostly used when you want to retrieve data from an external server and display it together with data from the Parent, Line-item or Lookup objects. Since the data is retrieved using a user-created Apex Class, it has the advantage of being able to retrieve data more freely than with internal Salesforce data sources.
For example, if you want to fetch real-time inventory numbers from an external server or ERP system, then you can write Rest API code in an Apex Class and point it to an external data source. Then, you will be able to view that data in the Line-Item Configurator.
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