what is the database and version? Is it import in empty model or you compare model to database?
database = Oracle 11
import in new empty model
the error happens in data modeler version 19.1 too
can you post the DDL for that table? Which version of Oracle 11g?
It could be due problem in JDBC driver if version is less 11.2. You can try with older version of DM - 4.2 or 17.x.