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Select Interface Type based on your scenario (SAP CPI E2E Inbound or SAP CPI E2E Outbound).
In the Document Number section, enter a message number from SCPI or use Int4 IFTT CPI Message Message Selector.
Transfer messages by Transfer Selected button.
After completing the above steps, hit on Save button to save a test case. After saving the Object Def. ID field should be updated automatically with relevant Object Definition ID.
The test case is ready to be executed.