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Users are unable to register a table in a feature class with a geodatabase.
This occurs when the table has multiple incrementing columns including an ObjectID column.
The ObjectID column, which is an incrementing column, is already created by ArcGIS when a feature class is registered in a geodatabase. A geodatabase requires the ObjectID field to be the incrementing field to allow the table to be registered.
The existence of multiple incrementing columns requires customization, as the delta tables must be synchronized.
Select the ObjectID column to allow the table to be registered with a geodatabase. For more information, refer to the following ArcGIS Help documentation, Workflow: Creating tables with SQL and registering them with the geodatabase.