[Uml-user] Recursive aggregations in umbrello 1.1.1

[A E Lawrence]

I am a new user of Umbrello 1.1.1 and I do not seem to be able to construct
a recursive aggregation: "Incorrect use of associations".

See http://www.auldenfire.com/aitpncc/resources/uml.shtml for an example 
where a Divison may contain another Division.

I can however draw a recursive association.

The archive mentions something similar for both associations and aggregations.

Is this intended? I have not read the UML definition so I am not sure if 
this is supposed to be legal. I seem to need it, but perhaps there is 
another way. But since recursive data structures are common, when they get 
mapped onto objects, this seems to be the natural way to show this in UML?

ael