User-exit while opening an activity in CIC0 / CRMD_ORDER?

Hi there,

does anyone of you know an user-exit/badi that runs every time when a activity is opened in the named transactions?

Or is there any user-exit that is called every time a user wants to use the edit-mode of an activity? That should be disallowed based on status and other factors.

Thanks a lot.

Regards

Markus