How to delete parameters in RZ10

Hello

We need delete any parameters in Instace profile by RZ10, is a recomendations from Going Live Support, I don't have clear how is the method.

This is my procedure, I go to extended maintenance in RZ10 press buttom Change, I find the parameter and then go to Parameter-delete, the system ask me if I want delete the parameter, click yes, and it confirm me parameter was deleted, press button Copy, it confirm me the changed profile was transferred.

Finally I save the profile and activate it, but when I go to see if the parameter don't exist, it continue in the profile.

Is there something that I doing badly?

Thank you for advanced