Rule if error

…or something like this

Number:Dimensionless localCurrentHumidity  "Aktuelle Luftfeuchtigkeit [%d %unit%]"   <humidity> (oWM)  { channel="openweathermap:weather-and-forecast:api:local:current#humidity" }

I make settings through PaperUI, set up like this:

   "PPM_8501000000000000": {
     "class": "org.eclipse.smarthome.core.items.ManagedItemProvider $ PersistedItem",
     "value": {
       "groupNames": [
         "gHome"
       ],
       "itemType": "Number",
       "tags": [],
       "label": "Children \ u0027s CO2 [% .0f %%]",
       "category": "carbondioxide"
     }
   }
}

In REST it is displayed like this:

{"link": "http://123/rest/items/PPM_8501000000000000", "state": "407.0", "editable": true, "type": "Number", "name" : "PPM_8501000000000000", "label": "Children \ u0027s CO2 [% .0f %%]", "category": "carbondioxide", "tags": [], "groupNames": ["gHome"]}

Righto. Now you’ve changed it to a Number type Item and it is no longer a Number:Dimensionless type.

What are we trying to acheive here?

There are no more questions, Thank you all.