When acting as a client to BNPP FX, the IAF should be configured with the BNPP specific configuration file, the distribution version of which can be found here:

Note that the requirement for a BNPP-specific configuration file means that an IAF using this configuration file must be used for BNPP FIX sessions only. The FIX adapter will not interoperate correctly with other FIX servers once it has been configured for BNPP operation. If you need to connect to other FIX servers as well as BNPP, the non-BNPP sessions should be configured in a separate IAF instance. However, BNPP and non-BNPP session can co-exist safely within the same correlator instance.

As well as the standard host, port, sender and target CompID parameters, the following parameters must also be supplied for the session: