Using this sample block:
------------------
grouping machine-def {
container machine {
description "";
container atts {
leaf thing

{ description ""; type iyt:counter64; }

leaf ipversion

{ description ""; type iit:ip-version; }

}
}
}
----------------

Assume that "iyt" represents teh "ietf-yang-types" import file, and "iit" represents "ietf-inet-types".

The diagram view shows the type name for "thing", but not for "ipversion".