Hey Stephen,
Thank you for the anwser.
I wrote wrong i am sorry i did change the java class reference in editor as you see in 1 picture but i did nothing in the config panel about the steplet.
1.Changing the Steplet (no congif panel changes here)
2. This is the steplet and i called the extended steplethandler here ()
3. Call the extended Bapi in the steplethandler (Map the enteded handler in config panel)
and i didnt change the part 
in the config panel. I am going to change it now and will try it now.
Do you think that is there any step that i missed different from the part class.
Thank you very much