Use
A Referring type test case refers to an existing automatic test case in another R/3 System. This type is useful when you use a central test management system which manages test catalogs of test cases and tests various R/3 Systems (with different Releases).
Create a test case containing a test routine in each system. It must have the same name in all systems.
Create a test case of type
referring , which calls the test case in the target system, in the central test system.The target system is specified in the Test Organizer when the test plan is created. You can create a test plan for each R/3 System to be tested and specify the correct R/3 System in each test plan.

Test cases of this type can only be called by the Test Organizer.
Procedure