#5 Link doesn't disappear even if the reference is removed.

[Koji Hashimoto]

In the domain model, an object can be contained by only one object. However, you can connect "Containment link" on the canvas in such a way that an object "A" looks to be contained by other objects "B" and "C" at the same time.

Suppose that "A" is contained by "B". If you connect a Containment link from "C" to "A", "A" is removed from "B" and added to "C" in the domain model. However, on the canvas, "A" remains to be contained by "B". As a result, "A" looks to be contained by "B" and "C" at the same time on the canvas.

The above strange condition is resolved by re-opening the editor, though.