You have selected elements that are connected to a parent object in a System. These elements cannot be removed from the System.

public static FailureDefinitionId ElementsConnectedToParent { get; }

Public Shared ReadOnly Property ElementsConnectedToParent As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ ElementsConnectedToParent {
	FailureDefinitionId^ get ();
}