title: Oracle data modeler logical design unique constraint
body: <p>How can I define column to be unique when creating logical model? It's because I want to create relationship 1:N and both columns are not primary key. I tried to define surrogate keys when defining relationship and typed column names in field Name of source/target, but when creating relational model, I don't get what I want.
  So basically I want define which columns from tables go into relationship and define unique constraint over column with multiplicity 1.</p>