When acting as a client to Currenex in MDA Mode, the IAF should be configured with the Currenex specific configuration file:

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