code: public void linkOneToOne(Object obj, ClassDescriptor cld, ObjectReferenceDescriptor rds, boolean insert)
      {
          storeAndLinkOneToOne(true, obj, cld, rds, true);
      }
docs: Assign FK value of main object with PK values of the reference object.
  
  @param obj real object with reference (proxy) object (or real object with set FK values on insert)
  @param cld {@link ClassDescriptor} of the real object
  @param rds An {@link ObjectReferenceDescriptor} of real object.
  @param insert Show if "linking" is done while insert or update.