Objectid fields created when Oracle Spatial data converted to File Geodatabase

[JaneWickers]

On a nightly basis I convert data from Oracle Spatial (not with arcSDE) to Feature Classes in a File Geodatabase. The ID field in Oracle Spatial is GID. When data is converted to a Feature Class using the Quickexport function two new ID fields are automatically generated:
Field Name = Object_ID, Data Type = Object ID and Alias = "Object ID"
Field Name = ObjectID, Data Type = Long Integer and Alias = OBJECTID
Why are both of these fields generated? Is there any way to control this so only the Field Name Object_ID is created?
Thanks.

Jane

[GlennBald]

Are you doing this in code? I am looking to do something very similar using c# and creating my own sdo_geometry class.

[JaneWickers]

Yes in python.