Hi Jai,
Thank you very much for your detailed answer.
I see that the issue is related with my IDM.
I did exactly same thing, it still doesn't work.
If I write parameter1 = CVR=FIORI directly in the ABAP package, it works; however parameter1= %MX_PARAMETER% still doesn't do anything. The value I am typing in the UI is not added to system.
Maybe the problem is caused by something else.
Thanks again for your help.
Best regards
Oktay