2. Missing element in address.
3. Numeric provided inside element is outside permissible range – for example, wrong numeric inside street name or house number; 100 Main St when house numbers range from 400-800 on Main St.
4. Multiple inputs for the element.
5. Input element ambiguous / multiple matches.
6. Element contradicts other elements. For example, the postal code information and locality information do not match.
7. Three strike rule/too many corrections in combination of several elements.
8. General Postal Authority Rule.