Or even better, query the DBA_DEPENDENCIES table (or its equivalent, USER_ ). You should see which objects depend on them and who owns them.
select owner, name, type, referenced_owner from dba_dependencies where referenced_name = 'YOUR_TABLE'
And yes, you need to see through objects to see if INSERT is happening.
Also this is from my comment above.
If this is not a production system, I would suggest that you raise the user A specific exception in TRIGGER- before INSERT with some user message or LOCK the table from INSERT and watch for applications that try to insert a failure in them. But yes, you can also get calls from many evil people.
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