Validating topology returns the following error message:
ERROR 999999: Something unexpected caused the tool to fail. Contact Esri Technical Support to Report a Bug, and refer to the error help for potential solutions or workarounds. A failure was detected inside the topology engine overlay processor. [error id: -2147467259] Failed to execute (ValidateTopology).The topology had the following rules:
Note: This is not a bug. However you may need assistance from an Esri Support specialist to rectify the issue.
The data was exported from the database, and the Integrate tool run on the data. Integrate removed a sliver from the data.
When the data was imported back into the database after Integrate, validating topology failed with the error above, because the tool recognized the data as completely new data, and not part of the original topology.
To resolve the error, the original topology rules must be applied to the new copies of the data:
After topology rules are reapplied to the repaired data, validating topology is successful.