While sending message to FTP Destination, it is common to see the error
To fix it, you need to promote the Filename property.
Assuming, you are using XML One-Way Bridge
Edit Enrich stage by clicking on “Property Definitions - “Collections”
Promote the property to “Filename”. Here I am simply promoting RequestId.
Then on the connector go to “Route Action – Collection” and add the Filename property to the Ftp destination.
Now once you deploy the solution and test the message again, the message should be successfully routed to the FTP destination.