Delete triggers

I have had a lot of trouble getting a DELETE trigger to do nothing (ie let the delete operation occur instead of cancelling it, as required)

The documentation on this is very thin on the ground - I`ve just spend 4 Hours googling and the best I could find was one of the main developers (Bruce?? sorry - too long ago) replying to an email in 2001. Which was to NOT cancel the delete operation, you need to return NEW or OLD.

- If I return NULL the operation is cancelled. ("DELETE 0")
- If I return NEW the operation is cancelled. ("DELETE 0") Now NEW is not set for a delete (because it would make no sense) so I am thinking this is the same as returning NULL
- If I return OLD the operation is cancelled ("DELETE 0").

I am using the 7.2 version.

To me this is either a bug in the system, or a 'bug' in the documentation. Look forward to hearing from you.

Cheers,
Mathew