Error Handling for Database Transactions

[eluser]JGarrido[/eluser]
I'm attempting to do some error handling for failed database transactions, but I'm not getting any error returned from CI.$this->db->_error_number() and $this->db->_error_message() will give me what I'm looking for, but only if the insert I'm attempting to perform isn't wrapped in a transaction.

Is this a bug (or an omission, as I realize those 2 properties aren't even documented), or is there something I'm overlooking?