Catalog Browser first displays the reference mapping in the context of the environment named DEV_Person. DEV_Person is a Catalog Environment that contains a collection of Catalog Environment Variables.
Catalog Browser next displays the reference mapping in the context of the SSS Connection Manager named AdventureWorks2014.OLEDB that consumes the Reference between the DEV_Person environment and the Load_Person.dtsx SSIS package. Note that this Reference Mapping is displayed as <Property Name> –> <Environment Variable Name>, or “ConnectionString –> SourceConnectionString”. Why? Catalog Browser is displaying the Reference Mapping from the perspective of the Connection Manager property.
The third instance of Values Everywhere is shown in the Package Connection References node. Remember, a reference “connects” a package or project to an SSIS Environment Variable (learn more at SSIS Catalog Environments– Step 20 of the Stairway to Integration Services). From the perspective of the reference, the reference mapping is displayed as <Environment Variable Name> –> <Property Name>, or “SourceConnectionString –> ConnectionString”. Why? Catalog Browser is displaying the Reference Mapping from the perspective of the Reference.
Check it out.