Problem

-- when setting the option "Reject duplicate EDI document IDs" at the "Message Validation" level, duplicates are not rejected as expected : a same EDI message (with same ID) can be processed twice without errors

Resolution

* this mechanism has some limitation : you need to define a flow from a partner to a community (not a partner to a partner), and to set the option "Process consumed messages using community delivery settings" at the trading pickup level

Then, the rejection rule should work as expected and Interchange should throw such error in case of duplicate :

"Control Id: 000106213 has already been received from Partner1"