It is fine for a polygon that consists of many polygons by using FME's GeometryValidator and inspector to view the polygon. However, when using FME to load it into SDO database, the following error occur, and no geometry inserted.
.........
"An error occurred while converting feature information to an Oracle object in column `GEOMETRY'
A fatal error has occurred. Check the logfile above for details
This occurred while attempting to process the following feature:
The following row was not written to Oracle table because of errors converting columns: GEOMETRY
......."