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Neil FlemingNeil Fleming 

Create an External Data Source and External Objects Trailhead "Project"

Instructions state:
From Setup | Develop | External Data Sources, select New External Data Source.
Name the data source OrderDB, and select Salesforce Connect: OData 2.0 as the type.
Enter as the URL. Leave the other fields with their default values, and click Save.

However, you also need to fill out the mandatory field, "External Data Source".  What is the value required for this field in this project?
SandhyaSandhya (Salesforce Developers) 

External Data Source is just the label field so you can name same as the name field (OrderDB).

Hope this helps you!

If this helps you please mark it as solved.

Thanks and Regards
Neil FlemingNeil Fleming
Many thanks! ...Neil