Native data base connector of Oracle DB

Hi everybody, in the Connection editor wizard, in the "Extend key information" step I'm being presented with all the columns from the schemas in order to choose a unique identifying key.

However I noticed that, from each schema, I'm missing the columns that have the "RAW" data type.

Problem for me is that in some tables those columns are the only unique differentiators between records and at the end if I try and "Browse" my target system some of the entries generate errors that prohibit me to use the sync project.

Has anyone had this issue before? or could anyone suggest a work around for this?

Much appreciated!