The Custom External Unique ID Handler and Business Message Syntax Validation Handler parameters are located in ePM’s TP Transaction Profile’s Settings tab. Make sure both of these parameters are set correctly, according to their usage in your system. See Figure 6–14, from the sample scenario’s Berlin TP for envA (Atlanta).
If the Unique ID handler is not selected, or if the message itself does not contain the Unique ID field (it is an optional field), random numbers are generated for the message Unique IDs. Third-party defined Unique IDs are not supported.