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This error occurs when adding an SDO_GEOMETRY column to a table already registered with ArcSDE:
“Abstract Data Types not supported”
This problem can occur when automatic registration of third-party Oracle Spatial tables recognizes that a DBMS table that was registered to ArcSDE has been altered to contain an SDO_GEOMETRY column. It may also occur any time a layer was deleted using sdelayer –o delete and then brought back into the schema with the same name under which it was previously registered.
Refresh your connection in ArcGIS.