I am trying to create a rule which filters out ADT_A08 messages, when they have an OBX segment and their EVN.4 is "COD" or EVN.4 is "FIN"
The attempt is:

I have sent messages with EVN.4 COD or FIN and they are filtered out correctly
However if I remove EVN.4 and leave just the OBX filled up, the message passes from the Process to the Operation.
How could we express that if the message has OBX, we want it to be filtered out‽

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