Well, I thought yesterday I could solve the problem using CMDB:Console (via browser or via Remedy User) as I saw exposed here:
But problem was still there, until now...
Although "Audit Option" shows, from my point of view, an incorrect value, digging in the workflow I found out that in field 'zIntAuditOption' the correct value is stored.
Thus, if you filter on OBJSTR:AttributeDefinition form by 'zIntAuditOption' = 1, you'll get all the the CORE fields with Audit Option = "Audit".
This was the original purpose for my question: just to know, in an easy way, all the audited CORE fields.
Hope this helps.