UML14 — UML 2 super/Composite Classes/Connecting parts of parts

Consider a model where a composite class, CC, has two parts A and B, both
typed by class CT. If CT has a part PT, then can I describe a connection
between A.PT and B.PT? It seems to me that the metamodel can't capture this
because Connections can only be associated to parts, not parts of parts (i.e
the metamodel for parts has a flat structure) . So the connection would end
up being just a reflexive connection from PT to itself, which would be typed
by a reflexive association on the type of PT.

If there is a way of connection parts of parts I would like to see more
explanation somewhere in the spec.

see above