How to invoke custom subscription based on which business event on sales order line cancellation?

I need to call a custom PLSQL function on sales order line update, split and cancel. I tried to implement by creating a custom subscription on event "oracle.apps.ont.oi.xml_int.status" and creating the corresponding processing constraints.

This is working for update and Split scenarios. But, not working for Cancel and nothing seems to be getting triggered on Cancel.

Please help and guide if this is the right way or if I am missing something.