"Changing" parameter and "Tables" parameter defintions in function module

If one defines "Changing" or "tables" parameters, they are treated as reference parameters.
It becomes obvious for "tables" parameters where one does not have option to check box for "Pass by Value". But for "Changing" parameters, they provide the checkbox for "Pass by Value". Even when you select this option, the function module seems to handle the parameter as a reference parameter (whatever changes you make to it in the function module are retained when you return back to a calling program).
My question is why then SAP has provided the checkbox of "Pass by Value" for "Changing" parameter?
Thanks.
Jitendra Mehta

Hi Chaiphon:
Thanks for explanation but I know the theory of "Pass by reference" versus "Pass by Value".
Let me rephrase my question.
When I use the importing parameter (say as a table with a dictionary table type) with reference (not "passing by value"), and if I modify the value of the parameter, the calling program (which calls function module) receives the changed value after the call.
When I use the importing parameter with "Pass by Value" box checked, the modifications made to the table inside the function module is not retained after the code leaves function module and returns to the calling program.
My question is why not the same behaviour with the "Changing parameter" in function module definition?
And if Changing parameters are always reference parameters, then why SAP has provided the "Pass by Value" check box?

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"Changing" parameter and "Tables" parameter defintions in function module

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