
You have:
Created a development component of type Dictionary
More information: Creating Dictionary Development Components
Opened the Java EE perspective
You use this procedure to create a connection profile and establish a connection to the Java Dictionary.
The Java Dictionary allows you to define database tables in a database-independent way. The table definitions are organized in Dictionary development components (DCs). The SAP NetWeaver Developer Studio allows the Java Dictionary to be accessed through the Data Source Explorer .
When you are using the Java Dictionary, you are accessing a metadata representation of a physical database only.
More information about Java Dictionary: Providing Java Dictionary Tables and Data Types
If you plan to use a native database to define your tables, you have to create a connection to that database.
More information: Creating Database Connections