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If you watched the video and are still encountering the issue above - make sure that the business system names are configured properly.
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Dynamic routing based on the value in the message payload
In addition to the above scenario you may also have the one where you message is routed to the correct system based on the value in a message payload. Watch the video below to see the solution for such scenario. Below scenario also can be helpful when you are encountering the issues like below during test cases execution:
Receiver Determination did not find any receivers at all
Missing message: Party: <party> Receiver <Receiver> Int4: <Interface> Ns: <Namespace>
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