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A ValueSpecificationAction may not have any InputPins, because Action::/input:InputPin[0..*] is a derived union, and ValueSpecificationAction does not specify any InputPin subsets

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CONSTRAINT
UML keywords
ValueSpecificationAction
Action
Action::/input
InputPin
Thanks to Axel Scheithauer for this explanation.
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  [UML-2.5.1] Action::/input : InputPin [0..*] ... The ordered set of InputPins representing the inputs to the Action.
  [UML-2.5.1] Property::isDerivedUnion : Boolean [1..1] = false Specifies whether the property is derived as the union of all of the Properties that are constrained to subset it.
  [UML-2.5.1] A Property may be marked as being a derived union, by setting isDerivedUnion to true. This means that the collection of values denoted by the Property in some context is derived by being the strict union of all of the values denoted ...
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