Field Name  | 
Explanation  | 
Internal ID Field  | 
Since the Internal ID field is automatically populated with database generated number, it is never editable.  | 
ID Field for Default and Custom Features  | 
Some default features are pre-defined in this module. These default features have an ID number of less than 1000. This number is non-editable. Only custom features you create can be modified, and those features must have an ID number greater than 1000.  |