Switch node mqtt object

Can't quite get a switch node working to pull out single mqtt data although it works in a debug node, missing something...

mqtt debug looks like this:
Screenshot 2022-11-02 151926

if I configure debug like this I get a single data
Screenshot 2022-11-02 152001

Have run it thru a split node OK, just can't work out the details for a switch which is needed to scale the 4-20mA before going to an influx node...

You don't need a Switch node, but a Change node, set to Move that propertyTo msg.payload.