Indeed Antonio,
I've used cal_item__delete and I haven't touched into the core's ad_procs.
Pkg versions are:
provides url="calendar" version="2.6.1d3"/
provides url="acs-events" version="0.6.1.1"
provides url="acs-kernel" version="5.9.1"/
I've noticed the dependencies (relationships) among calendar, acs-events and so, while I was debugging the "code workflow".
Thanks for the lesson! I understand why acs-events supports calendar pkg. It makes total sense.
Best wishes,