Screen Exit for Service order operations

Hi Gurus,

I have a requirement in which I need to add around 24 custom fields at operation level in t-code IW31/IW32/IW33. For each order operation user will enter the data in the custom fields. I didn't find a screen exit at operation level. Could you please let me know if there is any screen exit to add the custom fields at operation level.

Waiting for your valuable suggestions.

Thanks in advance

Regards,

Neelesh