In Tableau. This map was created with latitude generated and longitude generated. I tried to create calc fields to define the $4$ regions but got error operation is not permitted. I want the map to display the four regions with color identified on the legend so it sregion can display number of diseases. The prior IF statements did not work. I keep getting the error Latitude and Longitude are not defined. below is a description of the field. Longitude $($generated$)$

Role: Continuous Measure

Type: Database column

Remote column: $[$Longitude $($generated$)]$

Remote type: unknown

Default aggregation: Sum

Geographic Role: Longitude

Status: Valid

I cannot make generated latitude and Longitude geographic