The default field SE_ANNO_CAD_DATA is created when feature class is created in ArcGIS. This should not be mandatory field and one can add whenever required. It is not good to have a unnecessary field in database.
The SDO_GEOMETRY type cannot store all types of geometric elements that ArcGIS storage must support. These additional elements are written to the SE_ANNO_CAD_DATA field for Oracle Spatial data, the GDB_GEOMATTR_DATA field for SQL Server Geometry & Geography data, and PostgreSQL PostGIS data. These fields are not optional for data that is registered with the geodatabase.
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