3678001 - The Used In details for a Dictionary Entry shows unrelated models in SAP Signavio Collaboration Hub

For this scenario, Attribute Groups have been created.

The problem appears to be that the Used In details for a Dictionary Entry (aka Show Usages in Process Manager Dictionary) shows models that appear to be unrelated.

On examination, the Dictionary Entry is actually assigned to a BPMN-Diagram Custom Attribute, but it is not listed in the Attributes section in Hub.
(NOTE: If Attribute Groups are used, then the section is renamed to that Attribute Group).

Further, when Attribute Groups are examined, the specific Custom Attribute is not listed.

The Custom Attribute has not been added to an Attribute Group.
Therefore, it is not visible on the model in Collaboration Hub.

As per the Hub Attribute groups settings page:

Once you create your own groups, the attributes listed in "Ungrouped attributes" are no longer shown in SAP Signavio Process Collaboration Hub. 

Add the Attribute to an Attribute Group & set the Attribute Visibility to: Visible

Attribute Management | SAP Help Portal

KBA , BPI-SIG-HUB-AV , Attribute Visualization for SAP Signavio , Problem