An issue was noticed where Resources that were imported from an integration with a third-party application, were present in the Database, but were not visible in the Resource List View (Home -> Resources). These same resources were however noticed to be visible from Admin -> Resources.
The integration responsible for importing Resources into Clarity PPM, was using the application's XOG functionality to import records into the application. On further troubleshooting it was noticed that the XOG Writes that were being done were failing with the following error message:
Latest Version: 15.7.1
Remove dynamic lookup based attributes from the audit trail, and retry the XOG Write.
Please note that, although in this specific case, the Resource records were affected, the same can affect any other object instance types as well.