Add Custom fields into Work Order Operation -TCode IW31/32/33

Hi Expert,

I need to add custom fields into Work order operation ( TCode: IW31/32/33). Hence, i found one BADI "/***/BADI_AFVU_MAINT" and Implement it.

First thing, is it the correct BADI to add custom fields into Work order operation?

If yes, then why am i unable to display the custom screen from IW31/32/33. I didn't get any option to display this customer field from operation overview Screen. I found one Enhancement button, but it seems something different and  there also no option to display custom screen that have been added by BADI. Could you please help me to solve this issue?

Thanks in advance for your valuable inputs.

Thanks & Regards

Som