For example, in
Vocabulary with Inheritance, we see that there are four
Customer.operator.person terms in the Vocabulary due to the various forms of inheritance used by the entities and associations. If two or more of these nodes are dragged into the Scope window (as shown in
Non-Unique Nodes used in the Scope Window), they will be assigned error icons

to indicate that their names are not unique. Without unique names,
Corticon Studio does not know which one is intended in any rule that uses one of the nodes. To ensure uniqueness, aliases must be assigned and used in rules, as shown in
Uniqueness Established using an Alias.