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When adding a value in an attribute table, the following error is returned in ArcMap:
Error: The value you have entered is out of range or is not a whole number
There are two causes that can lead to this error:
Change the field type to what is appropriate for the data type of the value, or add a new field with a field type that matches the data type of the value. For more information, refer to the following ArcGIS Help documents: Modifying field properties and Adding fields.
Note: Before editing fields of a feature class, ensure that the data is not locked. For more information on schema locks, refer to the following ArcGIS Help: Schema locking.