code: public void linkMtoN(Object obj, CollectionDescriptor cod, boolean insert)
      {
          Object referencedObjects = cod.getPersistentField().get(obj);
          storeAndLinkMtoN(true, obj, cod, referencedObjects, insert);
      }
docs: Assign FK values and store entries in indirection table
  for all objects referenced by given object.
  
  @param obj real object with 1:n reference
  @param cod {@link CollectionDescriptor} of referenced 1:n objects
  @param insert flag signal insert operation, false signals update operation