Dirty areas in a utility network may be encountered under the following conditions:
- When performing a trace using the Validate Consistency option, and one or more dirty areas intersect the traceable features.
- When updating subnetworks, and one or more dirty areas intersect the subnetwork features. The subnetwork name is appended to the error message in brackets.
The dirty areas need to be validated to ensure that the results from the operation are consistent with the network topology.