How do I get Enterprise Architect to use correct class relationships when importing java source code?

Question

I've just imported some java source into 'Enterprise Architect', e.g:

class Truck
{
  BumperSticker bumperSticker;
  Vector<Wheel> wheels;
}

It's added the first member as an association, and it hasn't added the second as a relationship at all.

How do I get it to instead, add them both as aggregations, the second with a multiplicity of '*'?