The receive process is managed within a single transaction – receipt of the message and publishing of all component messages happens in a single transaction.
The standard behaviour is to suspend the entire transaction (all messages) if one of the messages fails.
The Xml and FlatFile Disassemblers have a Recoverable Interchange Processing option that allows all good messages to be published and only the individual failures to be suspended.
Both these mechanisms require all component messages to be successfully published before any can be used.