親子関係のパラメータセットです。
siPSetRelationship.siContainedPSet // 1 siPSetRelationship.siSharedPSet // 2 siPSetRelationship.siLocalPSet // 4 siPSetRelationship.siObjectPSet // 8 siPSetRelationship.siPortPSet // 16 siPSetRelationship.siParameterPSet // 32
FilterPSet ProjectItem.IsA CollectionItem.IsA ProjectItem::IsRelationship