The parcel fabric topology is validated using a required set of topology rules. You can define additional topology rules to enforce data quality in your organisation.
Learn more about the parcel fabric topology
Click Validate Extent 
in the Tools gallery on the Parcels ribbon to validate the parcel fabric topology in your map extent.
To validate the topology of an entire parcel fabric dataset or a large number of parcels, run the Validate Parcel Fabric geoprocessing tool.
The following edits and updates cause the topology to become out of date and require validation:
- Appending data to the parcel fabric.
- Editing parcel features (create, modify, and delete).
- Editing system-added attributes of parcel features. Editing user-added attributes fields does not generate dirty areas.
Validating the parcel fabric topology is an edit operation. You should not edit the parcel fabric in the default version, as edits are automatically saved and cannot be undone.
View errors in the Error Inspector
After validation, rule errors are displayed in the Error Inspector pane. Rule errors are violations of geodatabase topology rules. To open the Error Inspector, click Error Inspector 
under Validate in the Tools gallery on the Parcels ribbon.
Errors are represented as a rows in the Error Inspector table. Select a row to preview, see details, and fix methods for the error. Right-click a row to zoom to the error and see a description of the error and options to fix it.
Rule errors are symbolized in the map by their participating features, for example, line errors, point errors, and polygon errors. Make sure the parcel fabric layer as well as the topology error sublayers are turned on in the Contents pane to see rule errors symbolized on the map.
Fix errors
To fix a topology error, select the error in the Error Inspector pane and click the Fix tab on the preview window to display available fixes for the error. Use the Fix Error tool 
to fix errors in the map with a predefined fix.
The following errors can be fixed by building parcels:
- Lines - Must Be Covered By Boundary Of - Polygons
- Polygon - Boundary Must Be Covered By - Lines
- Lines - Endpoint Must Be Covered By - Points
Parcels can be built from polygons or lines and seeds. To build parcels in the map extent, click the Build Active drop-down arrow 
in the Construct group on the Parcels ribbon and click Build Extent 
. When parcels are built, missing parcel features (points, lines, or polygons) are created.
If topology errors occur because existing parcel features are not topologically aligned with each other, you can use parcel alignment and editing alignment tools to align the parcel features.