Fuction for canceling Orders Confirmation IW45

Good afternoon,

I need a function or a way to call IW45 (notifications is created at IW41) with a Order Confirmation and Cancel/Reverse (all versions of the notications if any).

Like AUFK wa > Function post canceling > AUFK reversed wa.

We have Z custom fields in IW41 that we need to update, for that, I think is better call reverse notification and create a new one with the new values, isnt it?

Regards!