Now it seems more the "Bug: Unable to insert or update Oracle st_geometry feature classes, encountering ORA-20085 errors"
http://support.esri.com/en/knowledgebase/techarticles/detail/42461
issue NIM095988 (http://support.esri.com/en/bugs/nimbus/TklNMDk1OTg4)
It is marked as solved in Nimbus, but with no solution in the bug report(?).