UMLR — isReplaceAll=true and lowerBound > 1

About the AddStructuralFeatureAction the UML 2.5 spec states that, if isReplaceAll is true: “[…]The StructuralFeature always has a single value when the Action completes, even if the lower multiplicity of the StructuralFeature is greater than 1 “( §16.8.3).

In the other hand, the semantics of the multiplicities states the following (§7.5.3): “If a MultiplicityElement specifies a multivalued multiplicity (i.e., upper bound greater than 1), then an instantiation of this element has a collection of values. The multiplicity is a constraint on the number of values that may validly occur in that set.”.

Does it mean that executing this action with isReplaceAll=true on a structural feature with a lower multiplicity greater than one will result in an invalid model or, in other words, that such a usage is somehow “illegal”?