Description
The Feature ID role field is used to collapse duplicate features in the reference data for each primary locator role. Mapping the Feature ID role field when there are no duplicate features in the primary reference data will cause the locator to not work optimally. This field should only be mapped when there are duplicate features in the primary data that have different attribute values, for example an alternate street name. In this case, the data must have a field that contains a flag that indicates which street name is going to be the primary name and you must also map the Primary Street Name Indicator role field. If the Feature ID is mapped, the Primary Street Name Indicator field is used to define the Preferred Street Name of features with the same Feature ID.
Solution
Ensure the Feature ID role field is not mapped when there are no duplicate features in the primary reference data.