Hi,
The "Attribute Mapping" is just the attribute mapping between IDM & OID.
In the ConnXP, show me the Containers->Account Container setting(screen shots). What objectclass is been defined to use ?
The objectclass u defined in ConnXP, need to be the same as what been used in your OID(Oracle Internet Directory).
As I mentioned, u need to find out the OID is using standard objectclass or extended objectclass.