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If the user has wants to assign a specification to a method, the opened dialog presents all operations (BehavioralFeatures) of a model. However, UML 2.3 states in section "13.3.2 Behavior" that the referenced behavioral feature must be either owned or inherited: • specification: BehavioralFeature [0..1] Designates a behavioral feature that the behavior implements. The behavioral feature must be owned by the classifier that owns the behavior or be inherited by it. The parameters of the behavioral feature and the implementing behavior must match. A behavior does not need to have a specification, in which case it either is the classifier behavior of a BehavioredClassifier or it is a behavior that can only invoked by another behavior of the classifier. Thus, the available choice is larger than the subset allowed by UML. It is quite difficult to select the right operation since the owning class is currently not shown and many operations of different classes could have the same name (e.g. due to classes implementing standard interfaces).
This is a general issue in the Properties view, where references are filtered by (meta)type, and not by context. The same problem occurs for e.g. "Subsetted properties" and many others.
